Seiko Professional Diver 600m Titanium 6159 7010The first 600m professional diver watch, was manufactured in 1975. This watch is the early model with "PROFESSIONAL 600" print on the dial. This watch was purchased from Mr. BQ, the leading expert on vintage Seiko. All components and authenticity are checked by him. Brand: SEIKO Model: Professional Diver 600m Titanium Ref: 6159 7010 Year: 1975 Movement: Self Winding(Automatic) Cal. 6159B Case: 50mm Material: Titanium Bracelet: Rubber Strap (Black) The