Zenith Defy Grey Dial Vintage Diver 37 Military Engraved Back "Nato Us Navy" Gay Freres Band 3-70.

Zenith Defy, the "Safe of Time" (so defined at the time), is an automatic watch produced in the 1970s, with impressive strength and impermeability for the time, so much so that it is declared waterproof up to 300m. It has a total steel case with screw back, a screw ring, a star logo screw-down crown and high-strength mineral glass. Dimensions (37mm) and weight are extraordinary for the time.Grey dial in good condition as pics.This specimen mounts the valuable manufacturing movement Zenith mechanical with automatic winding 2552 PC , which was the first Zenith automatic movement which guarantees greater precision.
Just been complete serviced .
Engraved at back as pic : NATO US NAVY.
Original crown Zenith signed star logo.
Zenith original stainless steel band Gay Freres clasp signed 3-70 full n. 12 links.
No box no paper.