Caliber Identification

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I’ve just got this 1935 omega hand wind watch and am curious which caliber it is.

This one is very very pretty, I think, in a 9k Dennison case.
 
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It could be a calibre 26.5 like the one in the attachment. The watch in the picture (a screen grab) actually has the pillar plate below the balance wheel marked 26.5.

 
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14
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9
It could be a calibre 26.5 like the one in the attachment. The watch in the picture (a screen grab) actually has the pillar plate below the balance wheel marked 26.5.

That’s further than I got, google wise. Is there a site where you can compare movements to identify them?