Grand Seiko SBGM257
SBGM257 2025–present or unrecorded end
Case
direct Dimensions and fit
Case length39.5 mm
Case width / diameter39.5 mm
Case thickness14.1 mm
Lug-to-lug46.9 mm
Lug widthNot recorded
Water resistanceNot recorded
The dimension basis is not currently recorded.
Open dimension source ↗Movement
AutomaticCalibre and mechanism
Calibre9S66
Normalized calibre9S66
GenerationMechanical Automatic
Power reserveNot recorded
Technical data
Linked to sourced calibre programme Conventional winding
ApplicabilityRequired
DirectionBoth
TPD minimum650
TPD target650
TPD maximum650
Conventional winding fields are evidence-linked reference data. They are separate from any device-specific axial-control profile.
Open winding source ↗Market context
Date not recordedMarket-value disposition
No exact-reference public market estimate has been admitted for this record.
Market observations are separate from manufacturer specifications and are not used to fill technical gaps.