Here's an interesting piece. This is a WWII era Hamilton 4992B, 16 size, 22 jewels (note the extra jewel for the seconds pivot). It is very similar to Hamilton railroad pocketwatch models, but features a center second hand and a 24 hour dial.
The hour wheel on this watch is geared such that the hour hand goes completely around once every 24 hours rather than the usual 12 hours. The watch also include a mechanism to stop the balance when the watch stem is in setting position to allow synchronization to the second.
The hour wheel on this watch is geared such that the hour hand goes completely around once every 24 hours rather than the usual 12 hours. The watch also include a mechanism to stop the balance when the watch stem is in setting position to allow synchronization to the second.
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