April 5, 2024
+++ Elgin Aircraft Chronograph E 37500 AN 5741-1 WWII KOREA +++
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As found E 37500 AN5741-1aircraft chronograph thought to be from WWII ERA. Missing 3 movement retaining screws Balance staff appears to be moving freely when observed through "adj" hole. Serial no 009224 The AN 5741-1 was an8-day elapsed time clock used for aircraft navigation purposes during and after WWII, made according to US Navy's Bureau of Aeronautics and the US Army Air Corps specifications (hence the "AN" designation). The US gov't. issued military contracts to both Hamilton and Elgin to build this clock because they wanted two sources of supply which resulted in Hamilton's and Elgin's cooperative effort in designing and producing the clock. The clock has a 24-hour dial, an 8-day, 16-jewel movement with a lever escapement and two barrel mainspring assemblies. The movement has 1 hour & 12 hour chronographs and civil date features designed for use as a navigational instrument in aircraft. The production arrangements were shared between Elgin and Hamilton. They did not duplicate part production. For instance Elgin solely made the escapement and associated parts incorporating its 'Elginium' hairspring material. Dual production in the sense of 'two makers having separate production lines' was not implemented. Total production was around 28,000 for both companies, Hamilton quotes their production as 15,641, leaving Elgin's
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