A GMT watch is designed to help its wearer read more than one time zone. For travellers, international business users and collectors, the appeal is practical as well as horological: local time can remain clear while a second time zone is tracked separately.
This guide explains the main GMT layouts, how they work, what to check when buying pre-owned and how to choose a luxury travel watch without relying on outdated price lists or annual trend claims.
What Is a GMT Watch?
GMT stands for Greenwich Mean Time. In watch terminology, a GMT watch usually uses an additional hand or display to indicate a second time zone, often against a 24-hour scale.
The exact implementation varies. Some watches allow the local hour hand to be adjusted independently, while others make the 24-hour GMT hand independently adjustable. Both can be useful, but they behave differently in day-to-day travel.
How Does a GMT Watch Track Two Time Zones?
A conventional display combines the normal hour and minute hands with a separate 24-hour hand. The 24-hour format helps distinguish day from night in the second time zone.
On watches with a rotating 24-hour bezel, the bezel can also be used to reference another offset, potentially allowing the wearer to monitor an additional time zone when the layout and movement support it.
Traveller GMT vs caller GMT
Enthusiasts sometimes distinguish between two common arrangements:
- Traveller or flyer GMT: the local 12-hour hand can usually be moved independently in one-hour steps while the 24-hour hand remains on a reference or home time.
- Caller or office GMT: the 24-hour hand is usually the independently adjustable hand while the main hour hand continues to show local time.
Neither is universally better. Frequent travellers often value quick local-hour adjustment, while an office-based user may prefer to set a second zone and leave it there.
Well-Known Luxury GMT and Travel-Time Watches
The Rolex GMT-Master and GMT-Master II are among the best-known examples, but many luxury manufacturers produce dual-time or travel-time watches. Omega, Patek Philippe, Tudor, Grand Seiko, Breitling and other brands have offered different interpretations.
Instead of treating a fixed annual “top watches” list as permanent, compare the specific references currently available and choose according to movement, size, water resistance, bracelet or strap, serviceability and budget.
Browse our current luxury watch inventory or view current Rolex watches.
What to Check When Buying a Pre-Owned GMT Watch
- Reference: confirm the exact model, year range and configuration.
- GMT function: test that the additional hand and any independently adjustable hour function work correctly.
- Bezel: if fitted, check alignment, rotation and condition.
- Condition and originality: inspect the case, dial, hands, bracelet and known replacement or aftermarket parts.
- Provenance: review box, papers, receipts and service history where available.
- Seller terms: understand warranty, returns and delivery responsibility.
A pre-owned GMT watch can offer access to discontinued references and a wider range of configurations, but resale value is not guaranteed and can change with market demand.
How to Set a GMT Watch
The exact procedure depends on the movement, so follow the manufacturer's instructions for the reference you own. In general, the process involves setting the minute hand accurately, establishing the reference or home time on the 24-hour hand, then setting local time on the main hour hand or vice versa.
A rotating bezel can then be used where appropriate to offset the 24-hour scale. Do not force the crown, hour hand or bezel if the mechanism does not behave as expected.
GMT Watches for Travel
A useful travel watch should be easy to read and easy to adjust. Consider:
- Legibility in daylight and low light
- Ease of changing local time
- Case dimensions and comfort
- Water resistance appropriate to your use
- Bracelet or strap security
- Power reserve and movement reliability
The most expensive option is not automatically the best travel companion. A practical reference that suits your wrist and routine may be more useful than a rarer collector piece.
Buying, Selling and Valuing a GMT Watch
Value depends on the exact reference, condition, originality, completeness, service history and current demand. Advertised prices are useful context, but they are not the same as completed sale values or a dealer purchase offer.
If you are considering selling a GMT-Master II or another luxury travel watch, see our luxury watch selling service in London.
Servicing a GMT Watch
A GMT complication adds functions that should be checked during servicing. Service intervals vary by manufacturer, calibre and use, so follow the guidance for your specific watch rather than applying one fixed interval to every mechanical GMT.
Seek attention sooner if there are problems with winding, timekeeping, date change, GMT-hand adjustment, crown operation or water resistance.
For repair enquiries, visit our watch repair page.
Frequently Asked Questions
Can a GMT watch show three time zones?
Some GMT watches with a 24-hour hand and rotating 24-hour bezel can be used to reference a third time zone, provided the user understands the offset and the particular watch layout.
Is a GMT watch only useful for travel?
No. It can also be useful for people who work with overseas teams, follow another country's business hours or simply enjoy the additional complication.
What is the difference between GMT and UTC?
For everyday watch-setting purposes they are often treated as equivalent reference times, although GMT and UTC have different technical definitions.
Do GMT watches hold their value?
Some references have historically maintained strong secondary-market demand, while others have not. Brand, reference, condition, originality and market cycles all matter, so future value should not be assumed.
How often should I service a GMT watch?
Follow the maker's guidance for the specific movement and have the watch assessed sooner if its performance indicates a problem.
Choosing the Right GMT Watch
Start with how you will use the watch. A frequent traveller may prioritise an independently adjustable local hour hand, while another buyer may care more about design, history or collectability. Once the function is clear, compare references on condition, originality, serviceability and price.
