Can anyone identify my watch?

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Yes, I’m aware of the difference thanks, I have other watches which follow your guidance.

You’ve valued it at what I had estimated it to be.

one last thing, roughly how much would you typically expect to pay for a service on one of these vintage Omega watches?

Many thanks
Service costs can often vary from country to country. Where are you?
 
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Newcastle upon Tyne, England
We all have favourites but I’d expect you to pay £100-150 plus parts and postage. OF members in NE England may have recommendations if you don’t already have a watchmaker.