With the development of intercontinental flights in the 1950s, aircraft began to cross several time zones in a short time, which generated the need to know simultaneously the time in different places of the planet (airport of departure and arrival, or local time and GMT time reference). The GMT-Master is designed to meet this specific need of line pilots, becoming the official watch of the famous airline Pan American World Airways, better known by the name of Pan Am. http://lemontretourbillon.wordpress.com/2014/05/09/gmt%E2%80%91master-ii-2014-by-rolex/

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