Timeline of Seiko movements

1924 Moeris Type 9

1926 Moeris Type 10

1926? Seiko Calibre Type 91

1927 Moeris Type 8

1929 Nation

1930 Nation

Seiko Type 100

Seiko Type 93

1946.08 Seiko Type New 10A, Suwa factory

1948 Seiko Type New 10B, Kameido factory. Based on Swiss FH175. Used in Seiko Extra Flat.

1950 Seiko Super

? Seiko Calibre 90 (Daini Seikosha - stop-watch movement)

1955.06 Seiko Unique, Suwa

1955 Calibre 11A (AS1382), Seiko First Automatic, Daini?

1956.06.10 Seiko Marvel, Suwa

1958.05 Calibre 55, Seiko Lord Marvel, Suwa (Marvel-based movement)

1958.05 Calibre 5420, Seiko Cronos, Kameido factory (Daini)

1958.09 Calibre 55? Seiko Laurel, Suwa factory, 1960.10, Kameido factory

1959.03 Calibre 560, Seiko Crown, Suwa

1959.07 Calibre 290/55-xx-x: Gyro Marvel (GM): Suwa

1960.02 Calibre 60, Goldfeather, Daini

1960.04 Calibre 603 Seikomatic, Suwa

1960.06 Calibre 3140, Liner, Suwa

1960.09 Champion, Daini

1960.12 Calibre 3180, Grand Seiko First, Suwa

1961.07 Calibre 5440, King Seiko First, Daini

1961.11 Calibre 402, Skyliner, Suwa

1964.06 5740A Seiko Lord Marvel with second-hand stopping (Crown-based movement)