Grand Seiko Spring Drive GMT – 40.5 mm

Reference Number
SBGE253G

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.

TECHNICAL SPECIFICATIONS

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
Weight: 172 g

Other details / Features:
– Screw-down crown
– 30 jewels
– 24-hour hand (dual time display function)
– Power reserve indicator
– Calendar-linked time difference adjustment function