I always wondered how they made all those tiny parts and screws used in watches back then with such precision.
Back to my Hamilton 22 Chronometer. When WWII began, no one in the USA was manufacturing marine chronometers, and virtually all of them were imported from England and Europe (mainly Switzerland). Of course, those sources halted supplies immediately, and Hamilton stepped up to the plate and started producing them. Their first one was the Model 21, basically much like an enlarged pocket watch. That sort of evolved into a purpose-built chronometer, the Hamilton 22, which was physically somewhat smaller and built on a different mechanism design. Both types were used during the war and afterward. The Hamilton 22 was made for both the Navy and the Army Air Forces (they also needed accurate watches) in two forms. One was mounted inside a hinged lid wooden case on gimbals, and the other was basically an enlarged pocket watch inside a metal case. I have read that Hamilton made around 30,000 Model 22s during WWII. There are usually several Hamilton 22s, and occasionally 21s, listed on eBay at somewhat shocking prices.
Not to be confused with the Hamilton .22. A single-shot break-open .22 cal. rifle produced by C. J. Hamilton and Son, Plymouth, Mich. between 1906 and 1930.
As for vintage watch and clock prices, nothing surprises me anymore. Most of the really good ones have gotten out of my price range.