Does someone know what this is? Omega 15 jewels 8051321

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You should show much more:
dial
movement
inner case back
etc.
otherwise nobody will be able to help
 
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It is the heraldic symbol of the Kingdom of Serbia, Croatia and Bosnia, a new realm created with the "Declaration of Corfu" at the end of the WWI

 
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..................... a new realm created with the "Declaration of Corfu" at the end of the WWI...............................

That turned out well didn't it. 🙄