Omega Naïad model, first waterproof stainless steel case from  1939

This is the very sought after Omega Naïad from 1939, caliber 26,5 SOB, with the advanced Omega screwed waterproof case, was one of the first waterproof model from Omega, with a very advanced case design.

The ocher dial is a very old redone, the case is 31 mm wide excluding the winding corwn, and 36,50 mm lug to lug.