Seiko Prospex Automatic Scuba Diver's  SRPA79J1 
Caliber: 4R36  Automatic  24 Jewels
Made In Japan
Stainless Steel Case & Bracelet
Black Dial
Luminous Hands And Markers
Screw Down Crown with screw in Case Back
Deployment Clasp
200M Water Resistance

Case width: 51.7mm
Case Thickness: 13 mm