The CWC Quartz Diver was first issued for the Royal British Navy in 1983 replacing the CWC automatic model. Initial movement was the 7 Jewel ETA 555.112. A truly superb timepiece, replaced the Rolex submariner issued watch in the early 80s (the Cabot Watch Company auto divers watch was issued for a year or two in the early 80s). Quartz movement, water resistant to 30 atmospheres, 300m. Screw back case.