Zenith vintage diver automatic watch.  Ultra Rare Model.  The watch is in great condition, near mint. Works perfectly.  I have never seen a Zenith diver model with the same rotating scale.  I believe the band is not original.  The watch measure is approximately 37mm without the crown. The band is small, I have a small wrist and it´s on the limit.  The ref or serial number displayed on the movement is 5972988 and caliber 2532PC, Let me know if any doubt.  Thanks.