Help on Identifying caliber post 1939 OMEGA VINTAGE

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Hi guys,

I need some help identifying the correct caliber on my watch.
I found that it is post 1939 according to the reference numbers on the movement, but I can't find any other reference that identifies the movement on the watch.
Sorry about my igonorence but I also never saw any omega like this one, with a squared movement on a round case, so any information you have on what might be this watch is really appreciated 😀

Thanks for the help!
 
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R17.8 SC from early '40's. Came with 16 or 17 jewels. Caliber 310 .
See if anything is inscribed under the balance.
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