GMT watches, also known as dual time zone watches, have a long and rich history dating back to the early 20th century. The concept of a GMT watch was first developed for pilots, as they needed a way to keep track of multiple time zones while flying.

The first GMT watch was created by Rolex in 1954, in collaboration with Pan American Airways. The watch, known as the GMT-Master, featured a rotating bezel that could be used to track a second time zone. This was a significant innovation at the time, as it allowed pilots to easily switch between the local time and the time at their destination.

Other watch manufacturers soon followed suit, and by the 1960s, GMT watches had become popular among not only pilots, but also travelers and world travelers. The added functionality of a GMT watch was useful for people who frequently traveled across time zones and wanted to keep track of the time back home.

Over the years, GMT watches have evolved to include a variety of features and complications. Many modern GMT watches now have a third time zone indicator, allowing the wearer to track the time in three different time zones. Some watches also feature a date function, which is useful for people who need to keep track of the date as well as the time.

The most common way to read a GMT watch is the 24-hour hand, which is usually the red hand, and the bezel rotates to show the different time zones, with the 24 hour markers being used to indicate the hour of the day, and the bezel marking the time difference in hours, with the "home" time being the watch's standard time.

GMT watches are also popular among collectors. Many vintage GMT watches are highly sought after by collectors for their historical significance and unique design. These watches often feature intricate details and craftsmanship, and can be quite valuable.

Today, GMT watches are still widely used by pilots, travelers, and world travelers. They are also popular among people in certain professions, such as international business executives and military personnel, who need to keep track of multiple time zones.

The modern GMT watches are available in different styles and designs, from sporty and rugged to elegant and sophisticated, and made by different brands. Some of the most popular modern GMT watches include the Rolex GMT-Master II, the Omega Seamaster Aqua Terra GMT, and the Breitling Navitimer GMT.

GMT watches have a long and rich history dating back to the early 20th century. They were first developed for pilots, but quickly became popular among travelers and world travelers. Over the years, GMT watches have evolved to include a variety of features and complications, making them even more useful for people who frequently travel across time zones. Today, GMT watches are still widely used by pilots, travelers, and world travelers, and are also popular among collectors. GMT watches are available in different styles and designs, and made by different brands. The most popular modern GMT watches include the Rolex GMT-Master II, the Omega Seamaster Aqua Terra GMT, and the Breitling Navitimer GMT.