Grand Seiko Sport Collection 40.5 MM Green Dial Spring Drive GMT Watch SBGE257

A Spring Drive GMT for the next generation

Equipped with a GMT hand, this watch features Grand Seiko’s unique Spring Drive caliber, which combines the motive force of a mainspring with the high precision of a quartz watch. Housed in a water-resistant stainless steel case with ceramic bezel, a 24-hour GMT hand and Lumibrite indices for exceptional precision and legibility complemented by the smooth motion glide of Spring Drive.

Exterior

Exterior:          Stainless steel with ceramic bezel

Case back:       Screw case back

Glass Material:            Dual-curved sapphire crystal

Glass Coating: Anti-reflective coating on inner surface

LumiBrite:       Lumibrite on hands and index(es)

Case size:        Diameter 40.5mm Lug-to-lug 48.7mm Thickness 14.7mm

Band width:    20mm

Clasp type:      Three-fold clasp with push button release

Movement

Caliber no.:     9R66 Instructions

Movement Type:         Spring Drive

Power reserve:            Approx. 72 hours(3 days)

Accuracy:        ±15 seconds per month (±1 second per day)

Functions

Water resistance:        20 bar

Magnetic resistance:   4,800 A/m

Other details / Features:        

Screw-down crown

30 jewels

24-hour hand (dual time display function)

Power reserve indicator

Calendar-linked time difference adjustment function