Grand Seiko

Tokyo, Japan. Founded 1960. Seiko Group.

Launched by Seiko in 1960 as its finest line and an independent brand since 2017; Spring Drive, Hi-Beat and Zaratsu polishing are its signatures.

S + three letters for the movement family (SBGA Spring Drive, SBGH Hi-Beat, SBGW manual, SBGX quartz...) + three digits, e.g. SBGA211; vintage 6245-9000.