Seikomatic

Seikomatic was the brand used for Seiko's automatic-winding mechanical watches from 1960 throughout the 1960s, starting with Calibre 603/6201, the first member of the calibre 62 movement family.

It was preceded by Seiko's first Automatic, from 1955, which used calibre 11A, a Swiss-designed AS 1382 movement which was licensed and manufactured by Seiko in Japan, and by the Gyro-Marvel, Seiko's first in-house designed and manufactured automatic watch (and the second in-house designed and manufactured automatic watch in Japan, after Citizen's Auto), from 1959, which used calibre 290, which was based on the Marvel hand-winding mechanical movement. The Gyro Marvel's calibre 290 was the first movement to use Seiko's simple Magic Lever pawl lever automatic winding design, which forms a module which can be bolted on top of an originally manual-winding mechanical movement design, rather than the more complicated Swiss-style reverser wheels automatic winding design.

Seikomatics, Seikomatic Self Daters, and Seikomatic Weekdaters used various members of the calibre 62 movement family, which was designed by Suwa Seikosha. The later Seikomatic slim, Seikomatic slimdate, and Seikomatic-R used the thinner calibre 83 movement family from 1963, also designed by Suwa Seikosha. The Seikomatic-P used the later calibre 51 (calibre 5106) movement family from 1967, which was designed by Daini Seikosha.