This may be an old re-cased citizens pocket watch. By looking at the movement screw, which one is missing or broke, it looks like it should have been in a case that would have had a groove on the side so the screws could seat in place.
What an interesting watch. The movement looks like the Citizen F - Type and was inside their first wristwatch.
Movement Type: Handwind Beats per Hour: 18,000 Jeweling: 16, 17
Movement Width: Movement Depth: Features: Sub-dial for seconds Production Start: 1931 Production End: 1959
All accounts mention 1931 as the launch of the first Citizen wristwatch - please read below. The dial on your watch suggests an earlier time. It actually looks to be from the 19 teens period, WW1. Other accounts say the first ever Citizen watch, a pocket watch was produced in 1924 - so that further adds mystery to your dial.
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