seiko 300M diver

[george_]

[desmo16]

The professional diver's watch of 300m specification which used the first high beat highly efficient movement in Japan. The highest-class mechanical caliber of 10 beats as the highest oscillation mechanical movement in the world. There were 3 new casing technologies such as one-piece case structure, and rotating-rocking structure of glass fixing structure, and W-type screw down crown.




http://www.makedostudio.com/watches/seiko-divers/
http://www.tokunaga.ne.jp/en/museum/006.html