Caliber lookup
Movement referenceGrand Seiko
4520
Hi-beat 36000 vph hand-wind no-date 45GS movement, Daini-built; chronometer-grade adjustment.
- Type
- manual
- Jewels
- 25
- Produced
- 1968–1972 ~
- Family
- Grand Seiko 45GS
Hi-beat 36000 vph hand-wind no-date 45GS movement, Daini-built; chronometer-grade adjustment.