Very nice indeed!
Cal 3600 automatic. In-house Lemania design. Basis is the cal 3000 HW which again is based on the cal S27 basis. Robust and well designed with Breguet spiral and full rotor winding.
For those interested you will see that the movement shares the unique "catch device" for the hairspring.
This is a "Lemania only" design feature you will recognize from the Omega/Lemania cal 320/321.
I have a catalog from 1956, but the ref is not listed. If you provide a serial number I could try to make a qualified guess on age.
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