Origin of GMT and its importance in watchmaking
GMT (Greenwich Mean Time) was established in 1884 as a global standard from the Greenwich Meridian, marking the world's time zones. In the 1950s, aviation demanded a reliable tool to manage multiple time zones, which led to the launch of the first GMT clock for intercontinental pilots.
Definition of GMT watch and its technical characteristics
A GMT watch allows at least two time zones to be read simultaneously by means of a fourth hand, known as the GMT hand, which completes one revolution in 24 hours. It is usually distinguished by its special colour or shape and is supported by a 24-hour scale on the bezel or on the dial itself.
How a GMT watch works in practice
The main hand marks the local time (12 o'clock), while the GMT hand takes 24 hours to make one full revolution. The reading of different times is done by the GMT hand and the 24-hour scale. With an adjustable bezel, it is also possible to add a third time zone.
GMT complication types: traveller vs. desktop
- GMT desktop: the GMT hand is adjusted without changing the local time.
- GMT Traveller: allows you to set the local time quickly, keeping the GMT hand as a global reference (UTC or “home time”).
Common movements and calibres in GMT watches
Many manufacturers use reliable Swiss calibres such as the ETA 2893-2 or the Sellita SW 330-1. Haute Horlogerie brands develop their own movements, such as the Rolex calibre 3285 or the MT5652 from Tudor, which allow independent adjustments of both hands.
Use of the GMT watch for the modern traveller
A GMT is ideal for frequent travellers: it allows you to read local time, home time and, if you use a rotating bezel, a third time zone. The minutes are shared between the two time zones, making it easy to use without the need for calculations.
Featured models with GMT function at Gordillo Jewellery
- Rolex GMT-Master II: icon since 1955, two-colour bezel and calibre 3285.
- Tudor Black Bay GMT: vintage aesthetics, rotating bezel and calibre MT5652.
- Omega Seamaster Planet Ocean GMT: ceramic bezel, calibre 8906 and resistance to 600 m.
- TAG Heuer Aquaracer GMT: sporty design with professional functionality.
- Longines Spirit Zulu Time: classic aesthetics, L844.4 movement and 24-hour bezel.
Advantages of choosing a branded GMT watch
A GMT watch combines technical sophistication, utility and refined aesthetics. It is ideal for executives, pilots, travellers or people who work with equipment in different time zones. It is also a clear example of precision watchmaking engineering.
Frequently asked questions about GMT watches
What does GMT mean on a watch?
The ability of a watch to display two or more time zones simultaneously by means of an additional 24-hour hand.
How do I use the GMT function?
The GMT hand is set to a reference time zone (e.g. home time), and the main hand is modified to the local time zone. If the bezel is rotating, a third time zone can be calculated.
What is the difference between GMT and UTC?
GMT is the original standard based on the Greenwich Mean Time. UTC (Coordinated Universal Time) is a more accurate modern version, although both are used as a global time reference.
Why is a GMT watch useful?
It is practical for travellers, pilots or global professionals. It allows immediate visualisation of the time in different parts of the world, which facilitates international organisation and coordination.
GMT Watches at Gordillo Jewellery: Swiss precision and global functionality
The GMT watch collection at Gordillo Jewellery includes high-end models, ideal for those who value Swiss engineering and need international timekeeping precision. Discover brands such as Rolex, Omega, Tudor, TAG Heuer or Longines and find the piece that best suits your style and needs.
