Answer first: A genuine GMT Seiko mod uses the Seiko NH34 automatic, which drives a real, independently set 24-hour hand so you can read a second time zone at a glance. It should also have a 24-hour bezel, sapphire crystal and a genuine Seiko-marked dial (never a luxury brand’s name). At Rosevari Watches, every NH34 GMT build is A$399, made to order. Made to be looked at twice.
A GMT watch shows two time zones at once, which is why it has been the traveller's watch for decades. Until recently, building a genuine GMT into an affordable Seiko mod was not possible. That changed with the arrival of the Seiko NH34 - a genuine Japanese automatic with a real, independent GMT hand. A GMT Seiko mod built on the NH34 is a true dual-time watch, not a fake complication.
If you have seen cheap "GMT" watches where the fourth hand is just decoration, this guide is for you. Here is how to tell a real travel watch from a pretender, and what the NH34 actually does.
Is a GMT homage a fake?
No. Same principle as every legitimate homage: the design language is a tribute, the dial is Seiko-marked, never a luxury brand’s name, and every part is disclosed. A counterfeit copies a luxury brand's name and lies. James Enloe drew the line in Worn & Wound back in 2013: "a homage watch is generally thought to be one that 'pays respect' to another watch by using elements of its design or style", where counterfeits "are made to be deceptive, owners will frequently pass them off as the real thing" (Homage vs. Replica vs. Counterfeit, Worn & Wound, 2 April 2013). A GMT homage borrows the classic two-tone "Pepsi" or "Batman" bezel look and puts its own dial on it, with a genuine movement inside. We tell you exactly what you are getting. New to modding? Start with our pillar guide, Seiko Mod Watches, Explained by People Who Sell Them.
Fake GMT, caller GMT, flyer GMT: know which one you are buying
This is the most important thing to understand before you buy, because a lot of cheap watches cheat here, and a lot of listings blur the terms. There are three tiers.
A fake GMT is just a fourth hand slaved to the main movement - it goes around once every 12 hours or is purely decorative and tracks nothing useful. It looks the part and does nothing. Always ask a seller directly whether the GMT hand is independently adjustable. If they dodge the question, assume it is decorative.
A caller GMT (or office GMT) has a genuinely independent 24-hour hand: you point it at a second time zone and it holds that zone while the main hands keep local time. This is what the NH34 gives you. The technical reference Caliber Corner documents the crown plainly: "1 (pulled out one click): Clockwise = GMT hand / Counterclockwise = Date setting", with the main time set at the second click (Caliber Corner, Seiko Caliber NH34).
A flyer GMT (or traveller GMT) is the layout where the main local hour hand jumps independently in one-hour steps, built for frequent flyers resetting local time the moment they land. That mechanism lives almost entirely in Swiss watches costing many times more. The NH34 is not one, and any seller who tells you an NH34 watch is a flyer GMT has not read the spec sheet.
The claim that matters at this price is simpler: is the second time zone real? On the NH34 it is - mechanically independent, set from the crown, driven by a genuine automatic.
The NH34: a genuine dual-time movement
The Seiko NH34 is a genuine Japanese automatic - hacking, hand-winding, running at 21,600 vibrations per hour with a duration of "more than 41 hours" on the manufacturer's own specification sheet - and it adds an independent 24-hour hand to the reliable NH-series platform. The same sheet lists the function in plain words: "24 hour hand or second time zone". It is the reason a real travel complication is now available at a three-figure price, on the same trustworthy base as the NH35 dive movement. We go deeper on the calibre itself in NH34 GMT Movement Explained.
How to read a GMT
The 24-hour hand points to a number on the 24-hour bezel or dial track. The everyday setup is main hands on local time and the 24-hour hand on home time, or on whichever second zone you live against. Set it at the crown's first click: turn clockwise and the GMT hand moves on its own while the watch keeps running. Rotate the bezel and you can even track a third time zone against the same hand. You always know what time it is in the zone you care about at a glance - which is the whole point.
Genuine GMT vs fake GMT
| Feature | Fake / decorative GMT | Genuine GMT (NH34) |
|---|---|---|
| GMT hand | Fixed or slaved to main hands | Independently adjustable |
| Tracks a real second zone | No | Yes |
| Movement | Often unnamed quartz | Genuine Seiko NH34 automatic |
| 24-hour bezel | Sometimes cosmetic | Functional |
| Useful for travel | No | Yes |
| Rosevari build | Never | This is what we build |
Bezel styles
GMT watches are known for their two-colour 24-hour bezels that split day and night: red-and-blue "Pepsi", black-and-blue "Batman", and darker stealth options. On a quality mod the bezel should have crisp colour separation and click firmly. The style is cosmetic, but a solid bezel action is a good sign of overall build quality.
All six colourways are live in the range at A$399 each: Bruce Wayne (grey/black), Batman (blue/black), Pepsi (red/blue), Coke (red/black), Rootbeer (brown/gold) and Sprite (green/black).
Who should (and shouldn't) buy
Buy a GMT Seiko mod if you travel, work across time zones, or simply love the look and want a genuine automatic dual-time watch without paying five figures. They have a steady following in our own order book: 15 of the 174 watches we have built to order since launch are NH34 GMT builds (order-book snapshot, 23 August 2026). Skip it if you will never use the second time zone and just want a clean three-hand watch - in that case a Submariner-style or Datejust-style mod gives you the same quality movement without the extra hand.
Australian brand, made to order
We are an Australian brand shipping free from Australia with AU-based warranty and support. NH34 GMT builds are made to order rather than pulled off a shelf; current build timelines are published on the shipping policy page. If you want it in your bag for a specific trip, order early.
Browse the current range in the GMT-style collection.
Frequently asked questions
Is the GMT hand on a Rosevari mod actually functional? Yes. Our GMT builds use the genuine Seiko NH34, which has a truly independent 24-hour GMT hand - a real dual-time complication, not a decorative fourth hand.
Is the Seiko NH34 a flyer GMT or a caller GMT? A caller GMT. The independent hand is the 24-hour hand, set at the crown's first click. The flyer layout, where the local hour hand jumps on its own, lives in far more expensive watches. Either way the second time zone on an NH34 is genuinely functional.
What is the difference between the NH34 and the NH35? Both are genuine Seiko Japanese automatics from the same reliable family. The NH35 is a three-hand movement with a date; the NH34 adds a genuine independent GMT hand for tracking a second time zone.
Is a GMT homage a counterfeit? No. It wears a genuine Seiko-marked dial (never a luxury brand’s name) and a genuine movement, all disclosed. A counterfeit copies a luxury brand's name, which we never do.
Can it track more than two time zones? Yes. With the main hands and the independent GMT hand you cover two zones, and by rotating a 24-hour bezel you can read a third.
How much does a GMT Seiko mod cost? Every NH34 GMT build at Rosevari is A$399 with free AU shipping. They are made to order; current build timelines are on the shipping policy page.
Written by Jordan, founder of Rosevari Watches. A real travel complication used to cost five figures - the NH34 changed that. Shop the GMT-style collection.
See the Bruce Wayne GMT mod · See the Batman GMT mod · Browse all GMT mods