Seiko 9S65
ProbableGrand Seiko's precision standard is its own and is not COSC certification; the two are frequently conflated in listings. The distinction matters when a specification claim is being checked against a dial or a certificate.
Specifications
- Movement manufacturer
- Seiko
- Frequency
- 28,800 vph (4 Hz)
- Jewels
- 35
- Power reserve
- 72 hours
- Winding
- automatic
- Complications
- Centre seconds · Date
Architecture
Grand Seiko automatic with an in-house Spron mainspring and Seiko's own escapement components, regulated to Grand Seiko's internal standard rather than to COSC.
Related calibers
Related caliber
Seiko 8L35Shares architecture; differs in finishing and in regulation standard.
References using this caliber
No catalog references are linked to this caliber yet.
Provenance of this record
Sources & Evidence
Secondary sourceAtlas & Crown research
Atlas & Crown — internal catalog research notes
Atlas & Crown
- Accessed
- 2026-08-18
Cited for
This referenceProbable
Last verified: Not yet reviewed