Vintage omega ID

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I was given my grandmothers old gold omega watch and I am not sure how to ID it. What do all these numbers mean and what year was it from. Help is appreciated.
 
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18 mio serial so 1961. Case is probably locally made. This type does not have a model name but is known as cocktail watch
 
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It's a US cased Omega with the case made by Ross.
This was done bi importing complete movements and having them cased in the US to lower import taxes.
Other comments as per the post by @Mark020.