12:00 noon on a 24 hour dial looks like 6:00 on a 12-hour dial. If you look closely at the dial, you'll see that it's a 24 hour dial so it takes a full day for the hour hand to make a full rotation. You'll often see these in a case or a box that was intended to isolate it and protect it from shocks or accidental damage. You’ll notice a couple of advertisements from WWII-era Life Magazines that featured the 4992B. Known as a "Navigator's Watch" as it was used by aviators to aid in navigation by the US Navy during the war. However, an extra jewel was added to support the second hand pinion, so the movement got 22 jewels. The movement was based on the 21 jewel, 16 size movement. One of the war-related watches was a pocket watch with a central sweep second hand. However, they did still produce some wrist watches using excess movements produced in the 1920's. 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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