These informations were mostly gathered through my own experience, from watches I actually had in hands. They reflect what I observed and are not the holy truth. Page updated March, 23rd 2023.
Text & Pictures : D. Broglin – Watch & Vintage
This is an attempt to list all Seikomatic, Business, Business-A and Presmatic models and their variations. Work in progress of course !
Seikomatic time-only (1961-1964)
Seikosha 603 movement
J13044E case
J14074D case
J14074E case
Seiko 6201 movement
Seikomatic SilverWave (1963-1964)
J12082 case
Seikomatic Self Dater and Slim Date (1962-1964)
Seikosha 394 movement
Seikosha 395 movement
Seikosha 840 movement
Seikomatic Weekdater (1963-1965)
Seikosha 400 movement
Seiko 6206 movement
Seiko 6218 movement
8950 case
8950T dial
Day at 3 o’clock
Seikomatic & Business (1964-1967)
Seiko 6216 movement
9000 case
9010T AD dial
day at 3 o’clock
1965
Seiko 6218 movement
8010 case
Seiko 6206 movement, days in English or in Kanji, in all letters
Seikomatic until 1966, then Seiko Business
8000 case
8010 case
8010TAD dial
Day at 9 o’clock
1965-1966

black dial
8020 case
8030 case
8040 case
8070T AD dial
8070R AD dial
8050 case
8060 case
8070 case
8100 case
8110 case
8120 case
8120T AD dial
1966-1967

black dial
8140 case
Seiko 6245 and 6246 movement
Seikomatic-P
5106 movement
8000 case
8010 case
Seikomatic-R, Business-A
8305, 8306 & 8346 movements
1010 case
5000 case
8001 case
8010 case
8020 case
8030 case
8040 case
8050 case
8051 case