help in identifying vintage omega open faced pocket watch

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hello, this watch has come me through the family estate, I am loath to try and open it to see the insides. I am going to take it to a professional appraiser

having said that I am wondering if someone here can give me a general clue, I cant find a close google image match . or anything close with general searches.

the omega font seems rather unique, I don't know if it gold , it feels gold heavy 10k perhaps.