![]() In fact, all of Hamilton's production was dedicated to defense purposes. The case was designed to suspend the watch to protect it from the vibration and turbulence of an aircraft as well as a protective glass viewing panel to the user could look down onto it without removal.ĭuring World War II, Hamilton, Waltham, & Elgin produced a variety of time pieces to support the war effort. ![]() The excellent steel case with glass window and rotation door, is marked with a brass data plate that reads: Nickel finish of the watch is very good with the only noticeable wear coming from the felt pad where it was held in the spring suspension case. The three main manufacturers of the AN-5740 and AN-5740-1 were The Hamilton Watch Co., The Elgin National Watch Co. Military prior to, during, and after WWII. The GCT or AN 5740/AN 5740-1 pocket watches were used for navigation purposes by all the branches of the US. This is a FULLY FUNCTIONING beautiful 1940 produced example of the Hamilton U.S Army Air Force GCT Navigation watch type AN 5740. As used by navigators on B-17 Flying Fortress and B-24 Liberator this is a FULLY FUNCTIONING Hamilton AN5740 pocket watch with steel carry case.
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