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Reference CK230. Pretty sure these were introduced ca 1943.
No data for case serial numbers on these so you can't correlate to year of manufacture.
Serial seems closer to 1937/8, however movements were sometimes not cased for many years.
An American market watch denoted by the OXG marking on the movement.
Thank you!
At the risk of sounding foolish, can you tell me how you arrived at the reference?