Seiko Self Dater

Self Dater was the early brand used by Seiko for their watches featuring a date complication, which was later supplanted by the Calendar designation. Self Dater refers to a watch which has the mechanism to chance the date displayed by itself automatically every 24 hours.

Watches using the Self Dater brand:

Cronos Self Dater (Daini Seikosha)

Crown Self Dater (Suwa Seikosha)

Seikomatic Self Dater (Suwa Seikosha, 1962)

Grand Seiko Self Dater (Suwa Seikosha, 1963)