Stainless steel 38 mm Rotary Chronograph Skin Diver / Yachting / Sailing watch, 1960s vintage with great original black dial and bi- directional bezel. This watch like the very similar Rotary Aquaplunge of the same period was rated for diving (6 ATM) plus has the unusual 45 minute register with multicolored (white, red, blue) used to countdown three 5 minute segments used for yachting/sailing purposes. The Landeron 51 manual wind movement works correctly and keeps accurate time. Watch is in lovely condition for a 55+ year old watch, the case is very good and the crystal is very good and clear. Rotary diving watches from the 60’s were made to a very high standard, designed for professional use and Rotary was an official supplier for the British Army. These diving chronographs are in high demand amongst tool watch collectors. Photos are magnified and show details not seen by naked eye, the case measures 38 mm across (not including crown) x 47 mm lug to lug, and is 12.56 mm thick.