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 bezel: Ceramics
Back cover: screw back cover
Glass material: dual curve sapphire
Coating: Inner non-reflective coating
Lumibrite: Yes (needle/index)
Case size: Width 40.5mm Length 48.7mm Thickness 14.7mm
Bandwidth: 20mm
Clasp: One-push three-fold method
Arm circumference length (longest): 195mm
Movement
Movement: 9R66
Driving method: Spring drive automatic winding (with manual winding)
Drive period: About 72 hours (about 3 days) at maximum winding
Accuracy: Average monthly difference ±15 seconds (equivalent to daily difference ±1 second)
Functions
Waterproofing: Reinforced waterproof for everyday life (20 bar)
Antimagnetic: can be
Weight: 172g
Other: ・30 koku ・24-hour hand (dual time display function)
・Power reserve display function ・Calendar interlocking time difference correction function ・Screw lock type crown
