Help identifying my grandads watch

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Hello, was wondering if anyone can help identify my grandad’s watch we just found. The numbers on it seem different from other Omegas we’ve seen so can’t quite identify what model it is.

 
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You’ll need to take it to a watchmaker and have it opened.

The dial has been refinished using a pattern never used by Omega. It also looks like hands were replaced.
gatorcpa
 
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Looks like a calibre 23.4SC inside. One of mine says hello :
I have note ref CK4044 but I can't find the source I used so I wouldn't be affirmative!