A Thin Omega Manual 1965

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I wonder if anyone can help me to identify this watch.
It was a Retirement Watch presented in 1965 for 41 years service.
I opened the watch and the bezel and glass came off leaving the dial, movement and caseback. I couldn't open it to see caliber and movement numbers.
Ultra thin at 6.9mm including glass, 31.5mm diameter.
Manual movement. Looks gold but no hallmarks.

Edited:
 
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I reckon it's a cal 600 or 601, gold. I'll pass it my watchmaker to dissemble to get the necessary details. I set the watch running yesterday and it's spot on with timekeeping.
 
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Probably a caliber 620. Two hand only. 2 piece stem. Movement come out from the front. Take it to a watch maker and reinsert the bezel and crystal