Professional 600m
diver's watch
Analog quartz movement : 7549)

Commercialization: in 1978


The professional diver's watch model of 600m saturation diving specification in deep sea diving which used the movement of the first quartz movement in the world. The second generation model of the professional 600m diver after the 600m professional diver's watch of [61] caliber which is made to upgrade, have 21 new technologies, such as golden color hard coating case of titanium nitride (TiN), as one-piece case structure, L shaped glass gasket structure, glass screw ring fixing structure, twin side shield crown structure, special elastic strap made from polyurethane rubber.