Seiko's 36,000 vph mechanical movement calibres

Pre-1963 - Calibre 9011, Daini Seikosha, stop-watch. Produced until 1968?

1963.06 - Calibre 890B, Daini Seikosha, stop-watch. Produced until mid-1977?

1966.06 - 5740C, Suwa Seikosha. Produced until 1976?

1967 - 19x4, Daini Seikosha. Produced until 1975.

1967 - 614x, Suwa Seikosha. Produced until ?

1968.09 - 45xx, Daini Seikosha. Produced until 197 ?

615x

618x

1968 second half?: 88ST (8800), Daini Seikosha. Produced until 1979.

9S65/8L55

Prototypes:

4420?

Swiss chronometer competition movements.