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Appears to be a small crown, no crown guard model. Probably 5508 with a later 5512 dial fitted. 5508 is a 100m watch, not 200m. I personally wouldn't worry about the dial (as it is completely wrong). If you can't find a 5508 dial, I'd have no problem putting in service parts, not polishing (anymore), getting it on my wrist and wearing it in memory of your Dad.
Good luck!
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