Skip to content
Dial&Lug
Citizen Promaster Skyhawk A-T JY8078-52L

GMT watches

GMT chronograph watches

A second time zone and a stopwatch in one watch sounds obvious and almost never happens at this money. Here is the one that does it, and the reason the others do not.

By Sawyer V. · Published

The short answer

The Citizen Promaster Skyhawk A-T is the one watch on this site that is genuinely both: Citizen's U680 Eco-Drive drives a chronograph and a dual-time display in the same 45mm sapphire case, rated 200m, with five years of warranty. If 45mm is too much watch, the 43mm Citizen World Chronograph A-T is a chronograph with radio-set world time. No mechanical watch at this level does both, and that is a price problem rather than an oversight.

This page exists because people search for a GMT chronograph and get shown watches that are one or the other. The confusion is reasonable: both complications live on pilots' watches, both involve extra hands, and the marketing copy for either one uses the word "aviation" at least twice.

They are different machines. A GMT tracks a second time zone continuously — the hand never stops and you never touch it. A chronograph measures an interval that you start and reset. Combining them in a mechanical watch means stacking a chronograph module on a GMT base, which is why that watch exists at four figures and not at three.

Light-powered quartz sidesteps the problem. A solar module can drive as many displays as the dial has room for, which is how Citizen fits a chronograph, a perpetual calendar, a dual-time readout and radio synchronization into one case for less than a mechanical GMT costs on its own.

On prices: every buy button on this page reads its figure from the live price layer and stamps the date it was checked, or else reads "Check price on Amazon". No price is written into this text. Service figures quoted here are the manufacturers' own published rates.

How we picked

We have not worn these watches. What follows is what we checked instead, on documents you can open yourself — the same criteria, in the same order, on every roundup on this site. The full method is on the methodology page.

  1. 01Both functions, actually working

    A second time zone you can read at a glance and a chronograph you can start, stop and reset. A tachymeter bezel is not a chronograph; a 24-hour scale printed on a fixed bezel is not a GMT.

  2. 02Who the movement commits you to

    Every watch that does both here is a module rather than a rebuildable movement. We say so, because it decides how long the watch lasts.

  3. 03Crystal and water resistance

    Sapphire and 200m on both qualifying watches. Doing two jobs is not an excuse to drop the rest of the spec sheet.

  4. 04Published warranty term

    Read from the maker's own warranty document, with the exclusions named.

  5. 05What it costs to keep

    A module is replaced, not overhauled. Where a maker publishes a service price we print it; where it does not, we say that too.

Disclosure · Some links below are Amazon affiliate links. If you buy through one we earn a commission at no extra cost to you. It does not decide what goes on this page or in what order — here is exactly how that works.

Quick picks

Ranked on the Keep Score below — six published specifications, weighted identically on every page. The last row is the one we would not buy.

#WatchBest forKeep ScorePrice
1
Citizen Promaster Skyhawk A-T JY8078-52L

Citizen Promaster Skyhawk A-T JY8078-52L

Chronograph and dual time in one 45mm case, sapphire, 200m, five years.

The only watch here that is genuinely both8.3/10
Check price
2
Citizen World Chronograph A-T AT8020-54L

Citizen World Chronograph A-T AT8020-54L

43mm, sapphire, 200m, 1/20-second chronograph with radio-set world time in five zones.

If 45mm is too much, and world time will do7.9/10
Check price
—
Seiko Prospex Speedtimer Solar Chronograph SSC947

Seiko Prospex Speedtimer Solar Chronograph SSC947

41.4mm, sapphire, 100m, V192 solar chronograph at a published $163 service.

Skip this one

A chronograph only, and the one to keep7.7/10
Check price
—

Baltic Aquascaphe GMT MK-II

39.5mm, Miyota 9075 true GMT, sapphire bezel and crystal, 200m.

Skip this one

A true GMT only, and the better watch for it8.4/10
Direct only
—
Tissot Chrono XL Classic 45mm T116.617.11.047.01

Tissot Chrono XL Classic 45mm T116.617.11.047.01

45mm Swiss quartz chronograph, sapphire, 100m, no second time zone.

Skip this one

Not as a GMT, at any size7.9/10
Check price

Keep Score is arithmetic, not opinion — six published specifications, weighted the same way on every page. The formula is on our methodology page, so you can re-run it yourself.

01

Citizen Promaster Skyhawk A-T JY8078-52L

Best for: The only watch here that is genuinely both

Citizen Promaster Skyhawk A-T JY8078-52L

8.3/10

Keep Score

Crystal
2.5/2.5
Serviceability
1.4/2.5
Water resistance
1.5/1.5
Warranty
1.5/1.5
Strap standard
1/1
Cost-to-keep transparency
0.4/1
$523.95 · View on Amazon

#ad Affiliate link · Price as of October 8, 2026

Citizen's U680 Eco-Drive runs a chronograph and a dual-time display from the same light-powered module, synchronized by radio to 43 cities, with a perpetual calendar on top. It is the only watch on this site that does both jobs without compromising either.

Sapphire, 200m and a 22mm lug width, with Citizen's five-year limited warranty — which excludes the power cell, case, bracelet and strap, and we would rather you knew that before you bought it.

The case is 45mm and Citizen publishes neither a thickness nor a lug-to-lug for it, so this is a watch to try on. And it is a module: when Citizen stops supporting the U680 the watch is finished, however good the case still looks. Buy it for what it does now, not as the watch you hand on.

It sets itself by radio, runs on light and is rated to 200m behind sapphire — and it is a module, not a movement. When the module stops being made, the watch is finished, however good the case still is.

Manufacturer specifications for the Citizen Promaster Skyhawk A-T JY8078-52L
MovementCitizen U680 Eco-Drive, light-powered, radio-synchronized to 43 cities, chronograph, perpetual calendar, dual time
Power reserveNot published
Case45mm stainless steel
Lug-to-lugNot published
ThicknessNot published
Lug width22mm
Crystalsapphire
Water resistance200m
Warranty5 years

Citizen's five-year limited warranty excludes the power cell, case, bracelet and strap.

Specifications read from Citizen Watch product page, JY8078-52L.

02

Citizen World Chronograph A-T AT8020-54L

Best for: If 45mm is too much, and world time will do

Citizen World Chronograph A-T AT8020-54L

7.9/10

Keep Score

Crystal
2.5/2.5
Serviceability
1.4/2.5
Water resistance
1.5/1.5
Warranty
1.5/1.5
Strap standard
0.6/1
Cost-to-keep transparency
0.4/1
$543.75 · View on Amazon

#ad Affiliate link · Price as of October 8, 2026

The H800 Eco-Drive gives you a 1/20-second chronograph, a perpetual calendar, a power reserve indicator and atomic timekeeping with radio control across five zones — which covers the same need as a GMT hand by a different route. You select a city rather than read a second hand.

Two millimeters narrower than the Skyhawk at 43mm, with the same sapphire, the same 200m and the same five years of Citizen cover.

The lug width is 23mm, the least common strap size anywhere on this site — standard straps come in 20 and 22, so budget for one made to order. The two-tone dial is a taste question rather than a specification, and it is the reason this is the second pick and not the first.

Sapphire, 200m, a perpetual calendar and a chronograph that runs on light — and a 23mm lug width, which is the least common strap size on this site. It is a module rather than a movement, so its long-term future depends on Citizen continuing to support the H800.

Manufacturer specifications for the Citizen World Chronograph A-T AT8020-54L
MovementCitizen H800 Eco-Drive, light-powered, atomic timekeeping with radio control in five zones, 1/20-second chronograph, perpetual calendar, power reserve indicator
Power reserveNot published
Case43mm two-tone stainless steel
Lug-to-lugNot published
ThicknessNot published
Lug width23mm
Crystalsapphire
Water resistance200m
Warranty5 years

Citizen's five-year limited warranty excludes the power cell, case, bracelet and strap.

Specifications read from Citizen Watch product page, AT8020-54L.

Skip this one

Seiko Prospex Speedtimer Solar Chronograph SSC947

Best for: A chronograph only, and the one to keep

Seiko Prospex Speedtimer Solar Chronograph SSC947

7.7/10

Keep Score

Crystal
2.5/2.5
Serviceability
1.4/2.5
Water resistance
1.1/1.5
Warranty
1.05/1.5
Strap standard
0.6/1
Cost-to-keep transparency
1/1
$629.95 · View on Amazon

#ad Affiliate link · Price as of October 8, 2026

No second time zone, so it fails this page's test outright. We list it because it is the chronograph we would actually buy: the V192 is accurate to plus or minus 15 seconds a month and Seiko publishes $163 to service it, which is less than overhauling a three-hand automatic.

At 41.4mm with a 45.9mm lug-to-lug it is the most wearable chronograph on this site, and it carries sapphire where the cheaper alternatives fit mineral.

If you want one complication done properly rather than two done adequately, this is the honest answer. The 21mm lug width is the only real irritation.

Seiko lists V-series solar service at $163 — cheaper than a 4R36 overhaul and far cheaper than a mechanical chronograph. The 21mm lug width is the annoyance: standard straps come in 20 and 22.

Manufacturer specifications for the Seiko Prospex Speedtimer Solar Chronograph SSC947
MovementSeiko V192 solar chronograph, +/-15 sec per month, six-month run when fully charged
Power reserveNot published
Case41.4mm stainless steel
Lug-to-lug45.9mm
Thickness13mm
Lug width21mm
Crystalsapphire
Water resistance100m
Warranty3 years

Specifications read from Seiko Watch Corporation product page, SSC947.

Skip this one

Baltic Aquascaphe GMT MK-II

Best for: A true GMT only, and the better watch for it

8.4/10

Keep Score

Crystal
2.5/2.5
Serviceability
2.5/2.5
Water resistance
1.5/1.5
Warranty
0.7/1.5
Strap standard
1/1
Cost-to-keep transparency
0.2/1
Sold direct by Baltic

We earn nothing on this link. Baltic sells it directly.

No chronograph at all, so it cannot answer this page. It is here because if the GMT half is the part you actually need, this is a better watch than either Citizen: Baltic states the Miyota 9075 is a true GMT, with a local hour hand that jumps independently, which is rare at the money.

A double-domed sapphire crystal, a sapphire 24-hour bezel insert that neither fades like aluminum nor chips like ceramic, 200m, and a 47mm lug-to-lug in a 39.5mm case.

Baltic sells direct, so there is no buy button from us and we earn nothing if you buy it. Baltic states two years of warranty from the date of shipment and publishes no service price.

Baltic states the Miyota 9075 is a true GMT — the local hour hand jumps independently — which is rare at this level. Add a double-domed sapphire crystal, a sapphire 24-hour bezel, a screwed crown and 200m in a 39.5mm case. Sold direct; we earn nothing on it.

Manufacturer specifications for the Baltic Aquascaphe GMT MK-II
MovementMiyota 9075 automatic, true GMT
Power reserve42 hours
Case39.5mm 316l stainless steel
Lug-to-lug47mm
Thickness13.8mm
Lug width20mm
Crystalsapphire
Water resistance200m
Warranty2 years

Baltic states on this product page that the warranty on its products is two years from the date of shipment.

Specifications read from Baltic Watches product page, Aquascaphe GMT MK-II.

Skip this one

Tissot Chrono XL Classic 45mm T116.617.11.047.01

Best for: Not as a GMT, at any size

Tissot Chrono XL Classic 45mm T116.617.11.047.01

7.9/10

Keep Score

Crystal
2.5/2.5
Serviceability
1.6/2.5
Water resistance
1.1/1.5
Warranty
0.7/1.5
Strap standard
1/1
Cost-to-keep transparency
1/1
$450.00 · View on Amazon

#ad Affiliate link · Price as of October 8, 2026

A tachymeter bezel and three sub-dials make this look like the watch this page is about. It has no second time zone and no way to add one.

As a chronograph it is good value: Swiss quartz with PowerDrive, which returns the hands to zero electronically rather than through a column wheel, sapphire, 100m, 11.02mm thick, and Tissot's published service pricing behind it.

If you came here wanting both functions, this is the watch to recognize and set aside. If you came wanting a big chronograph that is cheap to keep, it is the one to look at.

Tissot publishes a US service price list, which almost no chronograph maker at this level does, and PowerDrive drives the hands back to zero electronically instead of through a column wheel. Cheap to keep, and 45mm across.

Manufacturer specifications for the Tissot Chrono XL Classic 45mm T116.617.11.047.01
MovementSwiss quartz chronograph, PowerDrive, with end-of-life battery indicator
Power reserveNot applicable
Case45mm 316l stainless steel
Lug-to-lugNot published
Thickness11.02mm
Lug width22mm
Crystalsapphire
Water resistance100m
Warranty2 years

Specifications read from Tissot product page, T116.617.11.047.01.

The realistic options, side by side

Read from Citizen's, Seiko's, Baltic's and Tissot's own product pages. Citizen publishes no service price for any reference; Seiko publishes a full list by caliber.
Skyhawk A-TWorld Chronograph A-TSpeedtimer SSC947Aquascaphe GMT
Second time zoneYes, dual timeYes, world time in five zonesNoYes, true GMT
ChronographYesYes, 1/20 secondYesNo
PowerEco-Drive, lightEco-Drive, lightSolarAutomatic
Case45mm43mm41.4mm39.5mm
CrystalSapphireSapphireSapphireSapphire
Water resistance200m200m100m200m
Warranty5 years5 years3 years2 years, stated
Published serviceNoneNone$163, V-seriesNone
Lug width22mm23mm21mm20mm
Read from Citizen's, Seiko's, Baltic's and Tissot's own product pages. Citizen publishes no service price for any reference; Seiko publishes a full list by caliber.

Why a mechanical one does not exist at this money

A mechanical chronograph is an expensive thing on its own. Seiko charges $373 to overhaul an 8R chronograph against $176 for a 4R three-hand watch — more than double, and that gap is the honest measure of how much extra machinery is involved.

A GMT adds a second gear train and, if it is a true GMT, a jumping-hour mechanism. Stack the two and the movement alone costs more than the whole watch budget most people bring to this category. That is why the combination appears on four-figure Swiss watches and on solar modules, and almost nowhere in between.

If what you want is to understand what each complication costs to own rather than what it does, our GMT versus chronograph page sets them against each other on running cost.

What "module, not movement" means for you

Both watches that pass this page's test are modules. A module is a sealed electronic assembly: when it fails, a service centre swaps it for another one. Nobody rebuilds it, and nobody can make a replacement once the maker stops stocking them.

That is not an argument against buying one. A Skyhawk bought today will very likely outlast the interest you have in it, and it asks nothing of you in the meantime — no winding, no battery, no overhaul schedule. It is an argument against buying one as the watch you hand on. For that, our watches that last a lifetime page is the list to read, and every watch on it is mechanical.

Who should buy which

  • You travel and you time things, and you want one watch for both: the Skyhawk, if your wrist carries 45mm. Try it on first — Citizen publishes no lug-to-lug for it.
  • The same need, a smaller wrist: the World Chronograph A-T at 43mm. You select a city instead of reading a GMT hand, which is slower but covers more zones.
  • You time things and never cross a time zone: the Speedtimer SSC947. Sapphire, 100m, the shortest lug-to-lug here and a published service price.
  • You cross time zones and never time anything: the Baltic Aquascaphe GMT, or the Seiko 5 Sports GMT SSK001 if you want it on Amazon with a published service price behind it.
  • You want a mechanical watch that does both: not at this budget. Spend the money on one complication done well and keep the difference.

The watches that look like the answer and are not

Three patterns catch people out. A tachymeter bezel — the scale reading 60, 70, 80 around the dial edge — is a chronograph accessory, not a time zone. A 24-hour scale printed on a fixed bezel, with no fourth hand to point at it, does nothing at all. And a ring of city names without a radio module or a second hand behind it is decoration.

The test is simple: can you read a second zone without pressing anything, and can you time an interval without losing the time of day? If the answer to both is yes, it is a GMT chronograph. Our true GMT versus caller GMT page covers the other half of this confusion — the difference between a 24-hour hand you set and a local hand that jumps.

Questions people actually ask

Is there a watch that is both a GMT and a chronograph?

Yes. The Citizen Promaster Skyhawk A-T runs a chronograph and a dual-time display from one light-powered Eco-Drive module, in a 45mm sapphire case rated 200m. It is the only watch on this site that does both.

Why are there no mechanical GMT chronographs at this price?

Because the two complications are expensive separately. Seiko publishes $373 to overhaul an 8R mechanical chronograph against $176 for a 4R three-hand watch; adding a GMT train on top puts the movement alone above the price of the whole watch.

Is a world timer the same as a GMT?

Not quite. A GMT shows one extra zone on a dedicated hand you never adjust. A world timer, like Citizen's World Chronograph A-T, lets you select from many cities but shows one at a time. Both solve the travel problem; the GMT is faster to read.

Does the Skyhawk need servicing?

Not in the way a mechanical watch does — there is no overhaul schedule and no battery to change, because it runs on light. The power cell is a wear part eventually, and Citizen's five-year warranty specifically excludes it, along with the case, bracelet and strap.

What should I buy if I only need one of the two?

For the chronograph alone, the Seiko Prospex Speedtimer SSC947: sapphire, 100m, and $163 published to service. For the second time zone alone, the Baltic Aquascaphe GMT if you will buy direct, or the Seiko 5 Sports GMT SSK001 on a published $176 service path.

Sources

Every specification and figure on this page came from one of these documents. Where a manufacturer does not publish something, the page says so rather than filling the gap.

Read next

A wristwatch photographed against an airport departure board

GMT vs chronograph

Which complication earns its place, and the best of each.

A world map showing time zones, laid flat

True GMT vs caller GMT

Which GMT hand you set, who each kind suits, and examples of both.

Citizen Promaster Skyhawk A-T JY8078-52L

Citizen Nighthawk vs Skyhawk

Citizen's two pilot instruments — sapphire and radio-setting against price.

Citizen Promaster Skyhawk A-T JY8078-52L

Best solar chronographs

Three light-powered chronographs, ranked, and the mecha-quartz one to skip.

Hamilton Khaki Aviation Pilot Day Date Auto 42mm H64615135

Best pilot watches

Four pilot watches judged on glass, water rating and whether the movement can be rebuilt.