As today’s world gets more connected, more people than ever have become world travelers. With this particular travel comes the requirement to change between zones. To watch fans like us, that usually means having a GMT watch.
A GMT watch enables you to specify a second period for a further time zone. These watches were traditionally used by pilots, who utilize Greenwich Mean Time (GMT). Thus the expression”GMT watch”. However, in fact, you may put the secondary dial-up to whatever time you select. If you reside in New York, as an instance, you could travel the world over without forgetting what time your spouse is using straight back home. Here, I will be providing a summary of five of their best GMT watches under 1000 price range.
Reviews Top 35 Best GMT Watch Under 1000
Citizen Eco-Drive GMT
If you would like to take your GMT watch to the water, not be concerned about it, but also do not wish to invest a ton o’ moolah, this Eco-Drive out of Citizen may be your best choice. It is true HUGE (49mm), however, it has got that cool dual-crown, Compressor-style case thing happening, and also the battery must outlast you since it costs via the sun.
Water Resistance: 200m
Glycine Airman Double Twelve
Taking its title from the conventional aviators who used GMT watches, the Glycine Airman Double Twelve is extremely accurate for an automated watch. It boasts a GL224 Swiss automatic movement, with 25 stones plus a 38-hour electricity book. It rains in a lively 28,800 beats per hour, allowing for smooth motion. Not that you will also notice; the Airman Double Twelve does not have another hand.
Rather, what looks like another hand is really your secondary time zone index. The bezel acts as a time indicator. It is flat and wide, with etched numerals ranging from 1 to 12. You will still have to keep tabs on AM versus PM, that is a little disappointing, but the slick, workmanlike layout constitutes this.
The case measures 44mm in diameter and can be a comparatively compact 12.4millimeters in thickness. The screw-down screen back is made from mineral glass, which is highly resistant to scratches. It provides for a crystal clear perspective of this motion, complete with all the decorative strand that is designed especially to be considered. The very best crystal is every bit as exquisite. It’s a design layout, with smooth borders, but without so much of a curve it obscures the dial, and 3 layers of anti-reflective coating avoid glare.
The crystal and case are watertight to 100 meters, adequate for just about any purpose. The main time is put by a 3 o’clock crown, using a 4 o’clock crown to placing the GMT dial. Both crowns are screw-downs so that they won’t inadvertently get pulled out. Glycine finishes the package with a soft, calf leather watchband.
The main indicator is every bit as attractive. Nice white hashes markers off the moments, and create a wonderful comparison to the navy blue dial. Bigger hashes suggest the five-minute marks, with nice numerals marking the hours off. The broad, beveled palms have glowing lume stripes down the middle, and also have slender, metallic hints that extend all of the ways into the outer hash marks. A small date window finishes the image.
VICTORINOX INFANTRY GMT WATCH
Much more glossy and simple compared to preceding submission, Victorinox’s Infantry GMT is the ideal case of a barebones time-teller that is superb for people who find themselves traveling frequently. It is elegantly-executed using a hardy raw stainless steel case plus a comfy brown leather strap that contrasts beautifully against the black dial along with striking reddish GMT hand. In addition, it boasts a trusted quartz movement, is water-resistant to 100 meters, also includes a scratch-resistant solid crystal.
Beginner’s Luck: Our modest choice is usually reserved for women or younger buyers with no fiscal clout to go larger. Though lean on cost, the analog and digital mix together with wide color schemes make it an option that does not look nor function as cheap as the cost would have you think.
Torgoen T9 Oriole GMT View
Torgoen is an American watch company founded by Benzi Rosenski in 1998. Since its beginning, this business was famous for creating practical, secure, long-lasting, and economical timepieces for pilots.
Though quite cheap, the quality of the Torgoen T9 Oriole isn’t compromised. It has Swiss quartz Ronda motion which lets you place the GMT hand to another time zone. Besides that, it’s a high-quality stainless steel case with a mineral crystal glass window along with a screw-down stainless steel curved spine.
Its black dial has Arabic numerals hour mark and a date window situated between 4 and 5 o’clock. Its hands and indices will also be luminous, which can be observable for eight hours in total darkness. Additionally, this traveling watch is water-resistant to around 100 meters or 330 feet.
Steinhart Ocean GMT 490 Euros BNIB, 350 Euros 2nd hands
In all honesty, I really don’t have a lot of love for Steinhart, as for almost any brand which puts most of its advertising and gain on hommage watches. I much prefer an unperfect but authentic layout from a new with legacy, then an ideal ripped layout coming out of a new with no heritage, and so no stylistic participation in the growth of horology.
This having been said, it is tough to deny that there’s a marketplace for hommage watches, which Steinhart likely is your newest with the most recognition in regards to it. I have never worn one, but owners typically rave about the high quality of there watches, the reason I give it an entrance, although not being my cup of java: hommage facet aside, it is undoubtedly among the best VFM you can see in a GMT watch! Some excellent points about it:
Classic, classic design (Rolex owned)
Actual GMT not just using a GMT bezel, however, includes a suitable GMT motion and hands
Crazy inexpensive, and so Excellent VFM
39mm broad, a sweet place for most, including me
Pepsi bezel, for People Who enjoy these
ETA 2893-2 in its Elabore variant at this price-point, mad VFM!
30 ATM waterproof, so it’s possible to know what time it’s back home whilst scuba diving in Mexico!
Hamilton Jazzmaster GMT Automatic
A bit cuter than the alternatives on the listing. This GMT watch provides a very elegant appearance. In 42mm, it is a little bigger than your normal dress watch. The multi-city bezel also gives it a slightly more functional appearance.
It is accompanied by an exhibition case back, but sadly a mineral crystal onto the front. To get a watch of the price I’d expect Sapphire. Apart from that, it is a nice looking watch with 50m of all water-resistance and can be powered with the ETA 2893-2 motion as you would expect from a Swatch class view.
Alpina Startimer Pilot Quartz
A measure up concerning fit and finish from the previous two entrances, the Startimer Pilot Quartz GMT from Alpina is offered in several dial and bezel colors and includes a 42mm x 9.2millimeter steel instance, scratch-resistant sapphire crystal and quartz movement using 25-month battery lifetime. These glossy, pilot -inspired watches may look great on many different straps, and also the black dial/black bezel version especially could be dressed up or down.
Water Resistance: 100m
Christopher Ward C60 Trident 600
The Christopher Ward C60 Trident 600 comes in many versions, and that means you’re able to personalize your experience. Your first choice is whether to utilize the ETA 2893-2 motion or the Sellita SW330. Each has its own distinct advantages. The initial offer a 38-hour power book, and may likewise be hand-wound for those who want. The second provides a substantial 42 hours, even though it isn’t hand-windable. Both are hacking, which permits you to easily maintain time accurately down to the next.
The case is made of stainless steel and can be available in various variants. It is possible to pick between a 38, 40, or 42mm diameter based on how much wrist existence you would like. 1 thing all versions of this C60 Trident 600 is the nearly unheard-of 600 meters of water-resistance. If you devote a great deal of time at the water, then this is the watch for you.
The broad unidirectional bezel serves two functions. Mostly, it serves as your secondary time indicator, with mark from 1 to 24 hours. As a secondary purpose, in addition, it functions as a dip meter. Even though it comes in 4 distinct colors, they all are two-tone, allowing for simple oxygen monitoring in your own scuba tank.
For more traditional consumers people who will not use the watch submerged the C60 remains highly functional. Aside from the outer, 24-hour indicator, the interior index is also quite elegant. It’s miniature hashes to signify that the minutes, with broader hashes to signify that the 5-minute marks. The minute and hour hands are painted with a white lume complete. The second hand is extended and flat, whereas the hour hand has a barbell profile using a widened tip. The next hand along with also the GMT hand are equally slim and long. On the other hand, the GMT hand includes a high-contrast end for simple readability.
LUMINOX MEN’S SXC PC CARBON GMT WATCH
Luminox created a name for themselves constructing ultra-tough military dive watches. And while their experience still lies within that place, in addition, it pares superbly to the GMT watch you visit before beginning. Sinister in its almost all-black styling, nevertheless still striking as a result of its silver palms and red GMT hand, this timepiece boasts a trusted quartz movement, a carbon fiber case, includes a sturdy rubber strap with buckle closure, also can be water-resistant to 200m. If your travels take you outside on or beneath the surface of the sea, this may just be the fantastic GMT watch for you.
Victorinox Infantry GMT
Standard Issue: Swiss-Quartz motion in the firm who really devised the Swiss Army Knife, there is an extremely operational sense to the Infantry. Definitely meant for everyday transport, it is the type of piece that could interest an enlisted soldier, right down to the elastic mesh metal ring.
Bertucci A-2TR GMT View
Bertucci is a US-based firm that intends to design versatile and dependable timepieces. All of Bertucci watches are created with the best materials, ensuring that you are sturdy and durable.
Inspired by classic army watches, the Bertucci A-2TR includes a rugged design. For its attributes, it’s a dependable all-metal quartz movement. Besides a GMT function, in addition, it includes an abysmal black dial with a date function at 4 o’clock. Additionally, there’s a military time structure situated at the interior rim of the dial. The markers and hands will also be luminous, letting you read time in total darkness. Additionally, it’s water-resistant to around 200 meters or 660 feet. Best of all it has a ceramic Unibody™ situation with hardened sapphire crystal and a good ceramic unidirectional rotating band, which is very durable.
Victorinox Swiss Army Infantry GMT 450 Euros BNIB
Victorinox is still another brand that does not excite me a great deal. There’s not anything incorrect per-say with Swiss manufacturer with adequate legacy, great sufficient comprehension and, from what I have read, decent built quality. While not being economical, its costs also have a tendency to be around the more realistic side of horology, the reason why the manufacturer has an entry in this listing. There’s nevertheless something about the majority of their layout that I find really unexciting, colorless, dare I say dead?
The Infantry GMT is the ideal illustration of this: quite classic dimensions, classic and tools bezel, legible hands, and dial, certainly nothing wrong with it… and my trigger does not matter once I look at its images. If I were to choose a GMT from Victorinox below 1000 Euros, I would nevertheless go with this one:
Vintage, 40mm case
Very trendy steel GMT bezel
Actual GMT hand
Quartz movement: could be seen as a plus to get a traveler view, since it does not need Normal resets when not being worn and comes with a certain peace of mind when traveling
10 ATM water resistance, ideal late swims in resort swimming pools while in transit
Mido Multifort GMT View
With a compressor fashion bezel with another crown. The Mido is powered with Mido 1193, which is based on the ETA 2893-2. A bigger watch compared to the Glycine, arriving from a 42mm. It is more rocky compared to Hamilton, acquiring a sapphire crystal and 100m Water-resistance using a screw-down crown. Styling aside, I would pick this over the Hamilton daily of the week. They retail for about $1,200 but maybe found for under a grand if you look around. If you are eager to go gray market, I have seen them on Jomashop for under $800.
Among our favorite timepiece out of Baselworld 2019, the Atlas is no-nonsense, American-designed, Swiss-made GMT. Offered in numerous dial colors and strap alternatives, the Atlas perfectly straddles the line between game and everyday watch, and it has got 150m of water resistance, to boot. This may conceivably function as”one opinion,” and with pricing starting at $1,410 (on rubber), it will not break the bank.
Water Resistant: 150m
Farer Lander II
The Farer Lander II is just another GMT watch which gets its title from its roots in aviation. The general design is tasteful, with no modern-looking, mechanical accouterments. It uses an ETA 2893-2″top tier” motion, which includes 21 stones plus a serviceable 42-hour electricity book.
Lander II’s overall look is relatively minimalist, and at first glance, it may be easily confused with a more mundane watch. The case measures 39.5millimeters in diameter, offering a moderate wrist existence using a rounded profile and a sleek, curved bezel. The bezel leads into a domed crystal that is made from sapphire, using an anti-reflective coating to make sure a clear, unobstructed view.
At its greatest point, the crystal and case have a whole depth of 10mm, slim enough to slip beneath a shirt cuff, a comparatively tight one. And the watch is watertight to 100 meters, adequate for swimming and pruning with no issues. It is fastened to your wrist using a Barenia bridle leather ring which has a smooth, clean finish.
The dial is a glowing aquamarine color, with no blocking, resisting complications. The current window is understated, a little circle that bucks the trend of the square date windows. The main indicator is simple to browse, with big, white lume numerals at each hour place. There aren’t any hashes for person moments, but the snowy lume palms are simple enough to read.
The outer index is all but undetectable at first glance. The hashes are genuinely tiny, as well as the 1-24-hour numerals do not stand out much. However, the GMT hand is extremely visible, because of some high-contrast reddish finish that actually pops. Overall, the Lander II is a tasteful, minimalist watch that does not sacrifice performance.
KOBOLD LANGLEY GMT WATCH
You would think that it may be simple to make a minimalist GMT watch, but the fact is that a number of them are quite active and complex. That is not true, but with Kobold’s Langley GMT you visit before you.
Named after and inspired by Samuel Pierpont Langley an inventor, astronomer, and aviation leader this is in fact the very first Kobold watch built for civilians, in contrast to the military.
And though the standard variant is a lot tough and convenient, there is also the choice for any range of updates such as a unidirectional or bi-directional rotating bezel, a DLC coating, and just a diver’s variant that is rated to 500 meters.
Seiko Kinetic GMT
Motion Activated: Astonishingly simple to function for a kinetic view, the quartz movement is powered completely by the movement of the human body, however, will not come unwound the minute you touch the dial to place your extra hand. Ideal for extended trips, it is alive so long as you’re.
St. Moritz Momentum Vortech GMT Watch St. Moritz Momentum Vortech GMT View
Situated in Canada, St. Moritz Watch Corp. designs and builds high-quality sports watches beneath the Momentum® brand. Rather than adhering to fads, this firm focuses on crafting timepieces which are classic, practical, and high quality.
With its rugged design, the St. Moritz Momentum Vortech is the perfect traveling watch for daring men and women. It sports a GMT function which lets you monitor another time zone. Another fantastic aspect of this item is its own alert feature, which utilizes ceramic resonator to wake you from the sleep. For its other characteristics, it’s a 44mm titanium case with a scratch-resistant sapphire crystal. There is also a date function situated between 4 and 5 o’clock. Additionally, it’s water-resistant to around 100 meters or 330 feet, which means it is possible to wear it at the shower or simply take it swimming pool.
Eterna Les Historiques Air Force 1 900 Euros 2nd hands
Eterna is one of my favorite brands for a lot of reasons, and there was no way I can do this kind of post without a minimum of one watch coming in the Swiss business. The brand being from the mid-tier section, it is usually not feasible to discover their watches for under 1000 Euros, but the used marketplace frequently presents intriguing choices.
The Les Historiques Air Force 1 is the ideal illustration of this. It is a”bad men’s GMT”, in the meaning that the GMT complication stems from its inner rotating bezel instead of from a complication at the motion that’s a normal ETA 2824. I nevertheless still find this choice tremendously attractive for Many reasons:
Fantastic classic size in 37mm ideal for me and others with smaller wrists
Gorgeous case with an extremely nice coin-edged bezel at exactly the exact same lovely design as Tutima watches.
Fantastic dial, with really well-implemented hairline hands, small markings and beautiful color touch to distinguish the normal time indicators as well as the GMT indicators on the inner bezel.
It seems absurd, but Eterna is the only brand that could claim to have an”in house” motion sporting an ETA 2824.
I’ve observed this particular watch on Chrono24 to get 880 Euros. Not bad at all for a new with this kind of heritage, known quite a good finishing and constructed quality, and a great deal of admiration from view collectors!
The Boldr Globetrotter GMT watch
Boldr is just another Asian-based microbrand offering some distinctive layouts and alternatives out of the Swatch-group umbrella.
The Boldr GMT watch is a significant watch. It is probably best suited to men with elbows 7-inches and over. It measures 44mm in diameter and 53mm lug to lug. It is heavy. If you’re trying to find a beefy watch with some existence, this might be it.
They are offered in a few Bezel choices, black and blue’Batman’ design, Red and Blue’Pepsi’ Style and using a multi-city bezel. All of them come onto a rubber strap having an adequate diver’s grip. The strap will have to be trimmed to size due to the diver’s grip.
Yema Superman Heritage GMT
Basically a GMT-adapted variant of Yema’s flagship dive watch, the Superman, the Heritage GMT is offered in 3 Rolex-derived bezel color types, each limited to 100 pieces. Together with 300m of water resistance along with a Swiss ETA movement powering its time-tracking capacities, this Yema is just another candidate for the legendary”one watch” Just be ready for people to confuse it with a specific opinion from Rolex…
Water Resistance: 300m
Orient Polaris GMT
The Orient Polaris GMT is just another elegant watch which does not seem like anything special at first glance. It’s a plain, white dial without plenty of adornments. But, there are two issues worth noting. The first is a small date window at the 3 o’clock position. The next is a power reserve meter, positioned just under the 12 o’clock mark.
It monitors the Polaris’ 42-hour energy book so that you always know just how much longer your view will keep running. The Caliber 40P51 motion functions in a relatively slow but nevertheless true 21,600 beats per hour and can be equally hacking and hand-windable. This helps to ensure you could keep accurate time, right down to the next, and you will not ever be over a couple of spins from a powered motion.
The case measures 42mm in diameter and can be 11.98mm thick, offering a medium-sized wrist existence that is acceptable for many events. It’s a horizontal, scratch-resistant sapphire crystal that supplies a very clear view of the dial, using a pragmatic, sloped bevel that does not have any sharp edges. The opinion is water-resistant to 50 meters, so it is not likely to die on you at the shower, however, you should not take it swimming pool. The ring is stitched out of brown leather, using an alligator scale layout that is appealing to the eye, despite being synthetic.
ORIS REGA GMT WATCH
Launched in 1904, Oris includes a longstanding tradition of building excellent pilot watches. Therefore it should come as no surprise that among the best offerings can also be a GMT watch. This limited edition is a distinctive spin on their iconic Large Crown Propilot created in cooperation with Rega, the Swiss air-rescue support. Additionally, it includes an automatic motion, a date window, and a moment sub-dial. But just 2,000 of them were constructed, so in the event that you need one, you’ll most likely need to act fast.
Hager GMT Traveler
Uncomplicated: Everything you want to know about this timepiece is on the 316L Marine grade stainless steel face. It is big, running 50mm from lug to lug, but does not use the greater dimensions for jumble. Instead, it merely runs its automated HGR 60 motion combined, hacking seconds away and looks damn good doing this.
Nixon Diplomat SS GMT View
Founded in 1998, Nixon is a US-based firm that designs and markets consumer electronic equipment, jewelry, and apparel. Nixon’s goods are meant for people who enjoy snow and surfing, therefore most Nixon watches have a solid and stylish design.
The Nixon Diplomat SS sports an all-black outside which could effortlessly transition from work to perform with. It’s a 46mm stainless steel casing with a mineral glass crystal. In addition, it has Swiss motion with GMT function which permits you to inform the period of 2 distinct time zones at the same time. Additionally, it’s a date window situated at 6 o’clock. Apart from that, it’s likewise water-resistant to around 200 meters or 660 feet.
Fortis Flieger PVD GMT 700 Euros pre-owned
Fortis, such as Eterna mentioned previously, is yet another very under-rated Korean brand which stays barely called the frequent world, but appreciates enormous recognition from the more compact horology world as a result of its legacy in aviation. Because of this, I don’t have any difficulty adding their Flieger for this listing, although Fortis wasn’t among the first 5 makers during WW2.
This GMT model essentially is a redesign of the B type Flieger dialup, with hour indicators rather than the second ones on the first Flieger, and 24h GMT indicators on the interior indicator ring at which hours have been published on routine Fliegers. Other goodies about this view:
ETA 2893-2 motion
Mineral glass. A drawback for many including me personally, but a few such as the classic look that gives into the watch. Beware of the point before finally pulling the trigger on it.
Very wonderful vintage looks, especially about the 19 years old model I watched Chrono 24!
Just 5 ATM. Better not eject within the sea wearing this one!
This is it, please do not hesitate to let me know in comments what you think about the choice, and to suggest different alternatives which you would advocate at this price point. Have a fantastic day!
Vostok Komandirskie GMT View
At $78 plus a fraction of the price of those other watches on this listing, the Vostok Komandirskie GMT Watch is among the few not employing the ETA 2893-2 motion. Vostok is a Russian watch firm producing watches from the Christopol watch mill. They could trace their origins back into Stalinist Russia whenever they made watches to the Russian army and Navy.
They have since developed a bit of a cult following. They are not quite watching, the concluding is rather rough. They’re authentic tool watches and hard as nails. They are the AK-47 of the watch world. Even in the event that you pick up one of the pricier bits on this listing, a Vostok is a superb beater watch to add to any group.
The Komandirskie GMT is 41mm in diameter and fairly thick at 15mm, though some of this is a result of the domed acrylic crystal. 200m water resistance and a screw-down crown create it fairly rocky.
BELL & ROSS BR V2-93 GMT WATCH
Just like lots of the brands on our listing, Bell & Ross have a very long history of producing traveling – and – aviation-inspired timepieces. And while we are overlooking their signature case inside this watch, it is no less a stunning travel GMT watch that excels during its purpose and could make a stupendous addition to some fashion set. In addition to its own clean, timeless look, in addition, it features an automatic movement, a display case-back, a bi-directional rotating bezel, and can be water-resistant to 100 meters.
Home Cooking: A massive chunk of actual American-made steel, the Rambler collection comes directly from the Motor City and it reveals. Laser-etched steel that produces a prominent profile onto your wrist, that may be utilized as a weapon rather readily as a timepiece.
Luminox SXC PC Carbon GMT View
Widely known for constructing demanding military dive watches, Luminox is a US-based firm founded by Barry Cohen in 1989. All Luminox watches are crafted with the best heritage and accuracy of Swiss watchmaking, leading to durable, dependable, and high heeled watches.
The Luminox SXC PC Carbon is a rugged-looking watch ideal for adventuresome travelers. This view boasts a trusted quartz movement, a well-made rubberized band with buckle closure, and a carbon fiber case with mineral glass crystal. Besides its own GMT purpose, in addition, it includes a date window situated at 3 o’clock. Additionally, its hands are glowing, enabling you to read the timing in low-light ailments. Last, it’s water-resistant to around 200 meters or 660 feet.
Christopher Ward C60 Trident GMT 600
Christopher Ward is a British watch business, founded in 2004. Watches were created in the Uk, but manufactured in Switzerland.
The C60 Trident GMT 600 is the most appealing of the bunch for me. It does not really come in under $1,000, but quite near. One of these will set you back $1,020-$1,135 based on the bracelet/strap choice you pick. I believe that the red and blue bezels using a strap seem very great! I have seen a few on E-bay coming in just under the $1k mark.
Therefore, for around $1k ish you are going to acquire 600m water-resistance, a Sellita SW330 movement, sapphire crystal and a 5-year guarantee. There are not a lot of brands offering that sort of guarantee. This one is definitely worth checking out.
There you’ve got it! These are my top 10 selections. In case you’ve got a bit more into your budget, then it may also be worth checking out a number of the German Watch brands to get a GMT. A lot offer high quality and fantastic value for the money.
ZENITH PILOT MONTRE D’AERONEF TYPE 20 GMT WATCH
Not to be mistaken with the electronics manufacturer of the exact same title, the Swiss watch manufacturer, Zenith, is an under-the-radar watchmaker that deserves a fantastic deal more understanding than they now get. Well-equipped to proceed toe-to-toe together with the likes of TAG Heuer, Breitling, and much more, they supply a vast assortment of excellent timepieces.
And also this GMT watch, dependent on their mythical PILOT Sort 20, exemplifies precisely why. Enrolling in a distinctive black-blue-and-white colorway, this view leans on the aeronautical effect with a GMT hand-inserted onto it to get double timezone monitoring. Additionally, it has a 50-hour automated motion, 100-meters of water-resistance, and a leather strap.
Brera Orologi Eterno
White Knight: Among the strangest semi-unisex watches available on the current market, it requires a minute to process the white on white layout, but whenever the gentle refinement of this bit pops in, the Swiss Ronda 5030D quartz movement is merely icing on this very glowing cake.
Seiko SUN065 Padi Kinetic GMT View
Founded in 1881 by Kintaro Hattori, Seiko is a Japanese firm well-recognized for producing affordable yet high-quality watches.
Besides having a superb diver’s view, the Seiko SUN065 Padi Kinetic additionally has features that make it among the best GMT travel fountains on the marketplace. For starters, it’s powered by light energy, and it’s a six-month power book after fully charged. Furthermore, this view can also be durable, because of the 47.5mm stainless steel case and sapphire crystal.
Additionally, its deep blue dial has luminous markers and hands, and that means you will have the ability to browse the time in low-light ailments. Additionally, this timepiece can monitor another time zone owing to the fourth GMT hand. There is also a date window between 4 and 5 o’clock. Eventually, this opinion is water-resistant to around 200 meters or 660 feet.
Last update on 2021-10-15 / Affiliate links / Images from Amazon Product Advertising API