Omega Geneve 18K Rose Gold Watch - 2903? Vintage

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Nice watch looks in good condition relatively unpolished. Get watchmaker to open back all info on inside Caseback
Will look good with new crystal the crazing won’t polish out much.
Don’t let anyone polish it!
Post more info when avail and welcome
 
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So the same reference can have different dials, yours does appear to in fact be a 2903.

Here is another example in yellow gold with the same dial.

And I will say again DO NOT polish the case, you can never get that beautiful patina back.

 
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Did your Grandfather visit Portugal? The ding on the top left lug might be a Portuguese import mark, although it does seem a bit larger than what they normally look like.