Seiko SRPD51 5 Sports Blue Dial Diver contact-us they are still in active

they are still in active use today

The screw-lock case back

the green sunray dial features a day/date calendar

Stopwatch: 1-second stopwatch

Seiko SRPD51 5 Sports Blue Dial Diver contact-us they are still in activeCaliber Number 4R36 Movement Type Automatic with manual winding capacity Duration Approx. 41 hours Case Material Stainless steel Crystal Hardlex LumiBrite Lumibrite on hands and indexs Clasp Three fold clasp with secure lock ,push button release Water Resistance 10 bar Case Size Thickness: 13. 4 Diameter: 42. 5 Length: 46 Other Specifications Screw case back See through case back Unidirectional rotating bezel 24 jewels Day Date display Stop seconds