Seiko Calendar

Calendar was the later brand used by Seiko for their watches featuring a date complication, replacing the earlier Self Dater branding, though both were used in parallel for some time, the Calendar branding initially being used for lower-end watches, before being extended to use on all watches.

Watches using the Calendar brand:

Seiko Champion Calendar (Daini Seikosha)

Seiko Champion Calendar 860 (Daini Seikosha)

Seiko Skyliner Calendar (Suwa Seikosha)

Seiko Sportsmatic Calendar 820 (Daini Seikosha, 7625)

King Seiko Calendar (Daini Seikosha)

Grand Seiko Calendar (Suwa Seikosha)