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 August, 31st 2023.
Text & Pictures : D. Broglin – Watch & Vintage
This is an attempt to list all King Seiko models and their variations. Work in progress of course !
King Seiko 44KS (1964-1968)
44, 4402 & 4420 movements
44-2000
2000 RAD dial

44-2000, 1964
44-9990 KSK
King Seiko 45KS (1968-1973)
45, 4502 & 4420 movements
7010 case
8000 case
8010 case
King Seiko 52KS (1970-1975)
5245 & 5246 movements
7000 case
King Seiko 56KS (1968-1975)
5625 & 5626 movements, which had the same cases
5020 case
5030 case
7020 case
7030 case
7050 case
7080 case
7070T dial
7090 case
7070T dial
Chronometer Officially Certified
7100 case
7100T dial
Chronometer Officially Certified
7111 case
SS, SGP or GCAP
7110R, 7110T dials
Screw back
1972-1973
7113 case
7120 case
8001 case
8000T dial
Screw back
Pressed crystal
8011 case
8010T dial
Screw back
Pressed crystal