Seiko Diver 62MAS Reference 6217-8001Launched in 1965 the 62MAS was the first Seiko to be depth rated to 150m (previous watches were only rated at 50m). To find one of these watches in such beautiful condition is rare as whilst Seiko utilised a screw down case back and tropic crystal, they omitted a screw down winding crown relying instead on gaskets to seal the push in winder. This often led to the watches flooding and so finding one that has remained moisture free all its life is a