Omega 1939 Bullseye - movement?

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I really like this Bullseye, which I bought recently. Anyone else seen one of these?

The movement serial number gives it as 1939.

Any idea what the Cal of this is?

The database suggest one of these: T-17, 25,5, 26.5, 26.5 S, 33.3 CHRO, 35.5 S-T1, 37.5 L-15 R.
 
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What do you think it is? Have you Googled those movement numbers to make some comparisons and educate yourself a bit? I'm guessing not as you would clearly have seen some enormous differences...i.e some are round shaped.....
 
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Looks a bit like a T-17 to me from the list. But, it is rectangular in shape; no rounded sides.

And, I have discovered my recent habit of being wrong a lot.