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.

Specifications

• 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
• Caliber no.: 9R66
• Movement Type: Spring Drive
• Power reserve: Approx. 72 hours(3 days)
• Accuracy: ±15 seconds per month (±1 second per day)
• Water resistance: 20 bar
• Magnetic resistance: 4,800 A/m
• Screw-down crown
• 30 jewels
• 24-hour hand (dual time display function)
• Power reserve indicator
• Calendar-linked time difference adjustment function