A GMT watch, also known as a dual time zone watch, is a timepiece that displays two different time zones simultaneously. These watches are popular among travelers, pilots, and people who frequently communicate with people in different time zones. In this article, we will explore the history, workings, features, and popular brands of GMT watches.

The History of GMT Watches

The Origins of Greenwich Mean Time

Greenwich Mean Time (GMT) is the time zone that is used as a reference for all other time zones in the world. It was first established in 1675 when the Royal Observatory was built in Greenwich, England. The observatory served as a repository of astronomical data that was used by mariners to determine their longitude at sea.

GMT was originally based on the position of the sun in the sky at the Royal Observatory in Greenwich. This meant that noon GMT was the moment when the sun was at its highest point in the sky at that location. However, with the advent of modern technology, GMT is now based on atomic clocks that are accurate to within a billionth of a second.

The Development of GMT Watches

The first GMT watch was developed by Rolex in the 1950s. The watch was designed to help pilots keep track of two different time zones. This was particularly useful for pilots who were flying long-haul flights across multiple time zones. The Rolex GMT Master was an instant success and soon became the go-to watch for pilots and travelers alike.

Over the years, other watchmakers have created their own GMT watches, each with their own unique features. For example, the Omega Seamaster Aqua Terra GMT has a second time zone displayed on an inner rotating bezel, while the TAG Heuer Carrera GMT has a large date display and a second time zone displayed on a subdial.

Iconic GMT Watch Models

Some of the most iconic GMT watch models include the Rolex GMT Master, the Omega Seamaster Aqua Terra GMT, and the TAG Heuer Carrera GMT. These watches are not only functional, but they are also stylish and have become status symbols in their own right.

Many celebrities and high-profile individuals are known to wear GMT watches, including actors, musicians, and politicians. For example, former US President Bill Clinton is known to wear a Rolex GMT Master, while actor and comedian Jimmy Fallon is a fan of the Omega Seamaster Aqua Terra GMT.

GMT watches continue to be popular among travelers and watch enthusiasts alike. With their ability to display multiple time zones and their sleek, stylish designs, GMT watches are sure to remain a staple in the watch industry for years to come.

How GMT Watches Work

GMT watches are a popular choice for travelers, pilots, and anyone who needs to keep track of multiple time zones. These watches are designed with a GMT movement that allows for the display of a second time zone. In this article, we will explore how GMT watches work and how to set the GMT time.

The GMT Movement

The GMT movement is a type of watch movement that is specifically designed to display the time in two different time zones. It was first developed by Rolex in the 1950s for use by pilots who needed to keep track of the time in different parts of the world.

The GMT movement uses an additional hand or sub-dial to display the second time zone. This hand is typically located in the center of the dial and is often colored differently than the other hands to make it easy to distinguish.

The 24-Hour Hand

One of the key features of a GMT watch is the 24-hour hand. This hand is used to indicate the time in the second time zone. The hand makes one complete revolution every 24 hours, enabling the wearer to read the time in the second time zone at a glance.

The 24-hour hand is typically set independently of the other hands on the watch. This allows the wearer to easily adjust the time in the second time zone without affecting the time in the primary time zone.

Setting the GMT Time

Setting the GMT time on a watch is a simple process that involves adjusting the 24-hour hand to the correct time. Most GMT watches have a quick-set function that allows the wearer to easily adjust the time.

To set the GMT time, first, pull out the crown on the watch to the first position. This will allow you to adjust the 24-hour hand independently of the other hands on the watch. Next, rotate the 24-hour hand until it displays the correct time in the second time zone.

Once the 24-hour hand is set, push the crown back in to the normal position. The watch will now display the time in both the primary and secondary time zones.

In summary, GMT watches are a popular choice for anyone who needs to keep track of multiple time zones. These watches use a GMT movement and a 24-hour hand to display the time in two different time zones. Setting the GMT time is a simple process that can be done using the quick-set function on most GMT watches.

Features of a GMT Watch

Rotating Bezels

Some GMT watches have rotating bezels that can be used to calculate the time difference between the two time zones. The bezel can be turned so that the time in the second time zone is aligned with the 24-hour hand.

Dual Time Zone Display

The dual time zone display is the primary feature of GMT watches. It allows the wearer to easily read the time in two different time zones at a glance.

Water Resistance and Durability

GMT watches are often designed to be water resistant and durable, making them suitable for outdoor activities and travel.

Popular GMT Watch Brands

Rolex

Rolex is one of the most well-known GMT watch brands. The Rolex GMT Master was one of the first GMT watches to be produced and it has remained a popular choice among watch enthusiasts.

GMT-Master

Rolex GMT-Master Watches

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Omega

Omega is another popular GMT watch brand. The Omega Seamaster Aqua Terra GMT is a popular model that is known for its accuracy and durability.

Seamaster

Omega Seamaster Watches

The OMEGA Seamaster has a rich heritage that traces back to 1932 when OMEGA introduced it to commemorate the brand’s centenary. Initially designed with an innovative sliding case to ensure water resistance, the Seamaster quickly gained popularity among amateur and professional divers in the 1950s and 60s. Its robust construction and reliable performance made it a staple in the world of sports watches.

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TAG Heuer

TAG Heuer is a luxury watchmaker that produces a range of high-quality GMT watches. The TAG Heuer Carrera GMT is a popular model that combines style and functionality.

Seiko

Seiko is a Japanese watchmaker that produces a range of affordable GMT watches. The Seiko 5 GMT is a popular model that is known for its accuracy and reliability.

Conclusion

GMT watches are a popular choice for people who frequently travel or do business with people in different time zones. These watches are known for their accuracy, durability, and functionality. With so many different brands and models to choose from, there is a GMT watch to suit every style and budget.