Vintage Omega identification help required

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Hi All, newbie here! My wife has inherited an old Omega watch, dimensions are 30mm case and 16mm lug width. I cannot find it anywhere on line. It has a Dennison steel case back. Any help woudl be very much appreciated
 
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I agree.

Movement serial dates it to around 1945.
 
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1940s Ladies uk market case with a dial that was that was refinished sometime during or after the 1980s would be my best guess