Caliber lookup
Movement referenceGrand Seiko
4420
Hand-wind 18000 vph 44GS movement; the 4420-9000 case established Taro Tanaka's 'Grammar of Design' that defines modern Grand Seiko styling.
- Type
- manual
- Jewels
- 25
- Produced
- 1967–1970
- Family
- Grand Seiko 44GS
Notable references
4420-90004420-9990