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The Lexington was introduced on July 15, 1941. It is kind of strange in that it has the rectangular shaped 980 movement. Hamilton worked so hard to develope a rectangular movement and then they put it in a round case. Go figure.
They associated the Lexington with the military. The introductory pictures show a officer wearing the watch.
"For America's Minute Men - In the air, on land or sea -- wherever you see America's men in uniform, you will also see Hamilton's fine watch. Here are three rugged 17-jewel models with easy-to-read dials expecially designed to provide accurate time for America's armed forces." They were talking about the Sentinel, Endicott, and Lexington. The list price for the Lexington was $47.60. The Endicott used a 987 movement and the Sentinel 987-S.
They were not in the 1942 price list. The war was on and they were gearing up to make watches to military standards.