Seiko mechanical movement calibres list by accuracy grade

AAAA (4A):

Grand Seiko Men's V.F.A

AAA (3A):

Grand Seiko Special

AA (2A):

Grand Seiko Men's

King Seiko Special

A:

King Seiko

Chronometer? (Year? Observatory type?):

Grand Seiko First

Grand Seiko Self Dater

B:

Lord Matic Special

C

Lord Matic

Seikomatic-R