More information about 1950~60 Omega constellation

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My father bought this watch in Swiss land at the late 1950~60 and Recently gave it to me. Watch work.
I search on google and was not able to find it. Any additional information will be greatly appreciated, as well as estimates value.
Thank you.
 
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Late 1960s, early 1970s for sure not 1950s.

Looks like a reference 153.015, caliber 712.

18K gold, but the bracelet is not Omega.
 
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Yes, the OM on the dial would indicate it is gold as well.
 
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Thank you for the information. My father had the impression that he bought it between 1957 and 1965, he is 92 years old. So quit few years ago 😀
I probably would like to sale it. Should I buy Omega leather bracelet for it and remove the non Omega gold bracelet (And sale the bracelet for gold price)?
What would lead to higher price, and how much the watch worth?
 
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Should I clean it before posting it for sale. And how do you clan the gold?