Minerva 13-20 chrono Waterproof from 1950's. Very nice vintage piece in super original condition (case has never been polished). Stainless steel waterproof screw-back case with round pushers measures 34 mm without original crown. The original silver-grey dial with luminous indexes is in great condition. Movement is the famous high quality Minerva Cal. 13-20 (extra detailed, antimagnetic, shock-proof). It's a rare and nice original watch with a sympathetic engraving. Signed Minerva throughout. I've never seen a nicer example of this model!