GMT
A second time zone on a 24-hour hand. Genuinely useful if you live across time zones, and honest decoration if you don't.
A GMT watch adds a fourth hand that goes round once every 24 hours instead of every 12, read against a 24-hour scale. Set it to a second time zone and you can see, at a glance, whether it is a reasonable hour to call someone. That is the whole feature and it is a good one.
Until 2022 a mechanical GMT effectively started around $2,000. Then Seiko put the 4R34 into the 5 Sports line and the entry price collapsed to a few hundred dollars, which is why this category is suddenly worth writing about at all.
This is the one piece of jargon in the category and it decides whether the watch suits you.
Most people buying a GMT are callers who have been sold the idea that they need a flyer. If you have family two time zones away and fly twice a year, a caller is the right watch and it costs a fraction as much.
Every page in this section
GMT under $500
Mechanical second time zones under $500, and one 24-hour register that isn't one.
Top pick
Seiko 5 Sports GMT SSK001
Keep Score 8.0/10
We earn nothing on this link. Seiko sells it directly.
GMT under $1,000
The honest state of the mechanical GMT tier, and why the cheaper watch may win.
Top pick
Seiko 5 Sports GMT SSK001
Keep Score 8.0/10
We earn nothing on this link. Seiko sells it directly.
Travel watches
Four travel watches judged on how the second time zone is set — and what survives the trip.
Top pick
Citizen Promaster Skyhawk A-T JY8078-52L
Keep Score 8.3/10
#ad Affiliate link · Price as of October 23, 2026
Beginner GMT
How a GMT hand works, which mechanism you need, and two beginner-friendly picks.
Top pick
Seiko 5 Sports GMT SSK023
Keep Score 8.0/10
We earn nothing on this link. Seiko sells it directly.
Is a GMT worth it?
When the second time zone earns its keep, what it costs, and four worth owning.
Top pick
Citizen Promaster Skyhawk A-T JY8078-52L
Keep Score 8.3/10
#ad Affiliate link · Price as of October 23, 2026
SSK001 vs SSK023
Seiko's two affordable GMTs — identical inside, different on the wrist.
Top pick
Seiko 5 Sports GMT SSK023
Keep Score 8.0/10
We earn nothing on this link. Seiko sells it directly.
SSK001 vs Aquascaphe GMT
The cheapest mechanical GMT against a true GMT — which hand actually jumps.
Top pick
Baltic Aquascaphe GMT MK-II
Keep Score 8.4/10
We earn nothing on this link. Baltic sells it directly.
Small-wrist GMTs
Four GMTs that fit a smaller wrist, with the lug-to-lug for each.
Top pick
Baltic Aquascaphe GMT MK-II
Keep Score 8.4/10
We earn nothing on this link. Baltic sells it directly.
True vs caller GMT
Which GMT hand you set, who each kind suits, and examples of both.
Top pick
Baltic Aquascaphe GMT MK-II
Keep Score 8.4/10
We earn nothing on this link. Baltic sells it directly.
Top pick
Baltic Aquascaphe GMT MK-II
Keep Score 8.4/10
We earn nothing on this link. Baltic sells it directly.
The one watch here that is both a GMT and a chronograph, and why there is only one.
Top pick
Citizen Promaster Skyhawk A-T JY8078-52L
Keep Score 8.3/10
#ad Affiliate link · Price as of October 23, 2026
sapphire GMTs
The three GMTs here with sapphire, and the four good ones without it.
Top pick
Baltic Aquascaphe GMT MK-II
Keep Score 8.4/10
We earn nothing on this link. Baltic sells it directly.
Fleuss GMT vs Aquascaphe GMT
True GMT and a 47mm lug-to-lug against a caller GMT, Amazon availability and 51mm.
Top pick
Baltic Aquascaphe GMT MK-II
Keep Score 8.4/10
We earn nothing on this link. Baltic sells it directly.
SSK001 vs Fleuss GMT
Sapphire and 150m against Hardlex and a published $176 overhaul — a dead heat at 8.0 each.
Top pick
Seiko 5 Sports GMT SSK001
Keep Score 8.0/10
We earn nothing on this link. Seiko sells it directly.
Quartz GMTs exist and cost far less — the Q Timex GMT is a 38mm steel watch with an acrylic crystal that will do the job for a fraction of the price and cost almost nothing to keep running. If the second time zone is the point rather than the mechanism, that is a genuinely sensible purchase, and it is on our under $500 GMT page for that reason.
The argument for mechanical is the argument for mechanical everywhere: it can be rebuilt indefinitely, and Seiko publishes what that costs. A 4R34 sits in the same $176 service band as the rest of the 4R family, which makes an entry mechanical GMT one of the cheapest complications on this site to keep running.
If you do not have a specific second time zone in mind right now, you will not use the hand, and a GMT is then just a busier dial and a slightly thicker case than the three-hand version of the same watch. That is a fine reason to buy — dials are allowed to be enjoyable — but it is not the reason the marketing gives, and it is worth being clear with yourself about which one applies.
If you regularly need to know the time somewhere else — family abroad, colleagues in another zone, frequent flights — genuinely yes, and more conveniently than a phone because it is already on your wrist. If you do not, the hand becomes decoration.
On a caller, the 24-hour hand is independently adjustable and the local hour hand is not, which suits someone tracking a distant zone from home. On a flyer, the local hour hand jumps in one-hour steps, which suits someone who is themselves traveling. Flyers cost considerably more.
Yes — the 4R34 drives a genuine, independently settable 24-hour hand. It is a caller rather than a flyer, which is the honest distinction, and for most buyers it is the mechanism they actually want.
No. A quartz GMT does the same job for less money and almost no running cost. Buy mechanical if you want a rebuildable movement and are happy with the servicing that implies; Seiko's 4R34 sits in the $176 service band.
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.
