Grand Seiko SBGJ231


CaseStainless steel Case back: Stainless steel and sapphire crystal
GlassDual-curved sapphire crystal
CoatingAnti-reflection coating on inner surface
Case sizeHeight 46.2 mm x Diameter 40.0 mm × Thickness 14.0 mm
The perimeter of bracelet200.0 mm
BandStainless steel
Movement Caliber 9S86    Instructions
Driving systemMechanical automatic with manual winding
Power reserveApproximately 55 hours
Accuracy+5 to -3 seconds per day (when static) Note: This accuracy is the result of measuring the loss/gain of the time for seventeen days before the inside movements of the watch are put in the case. The measurement has been done in the factory where temperatures or position of the movements are controlled. When the watch is actually worn, the accuracy should be from -1 second/day to +10 seconds/day (-1 second/day to +8 seconds/day for Cal.9S85, 9S86).
ClaspThree-fold clasp with push button release
Water resistance10 bar
Magnetic resistance4800 A/m (60 gauss)
RemarksGMT hand Screw down crown See-through back Screw back Jewels: 37 Tri-fold push button release clasp Caseback with lion emblem 24 hour hand (dual time display function) Stop second hand function Quick correction function of time difference adjusting to a calendar
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