The first 9F quartz GMT model for Heritage Collection Caliber 9F86 is based upon, and has all the precision and durability attributes of, the original 9F but incorporates a GMT function that allows the watch’s precision to be maintained when the hour hand is adjusted independently. This is made possible by new components that have been created especially for this movement.The watch allows you to move the hands without stopping the watch when setting it to local time. This achieves a convenience in which excellent accuracy of the quartz watch won’t be lost. Exterior: Stainless steel Case back: Screw case back Glass Material: Dual-curved sapphire crystal Glass Coating: Anti-reflective coating on inner surface Case size: Diameter 40.0mm Lug-to-lug 47.0mm Thickness 12.2mm Band width: 20mm Clasp type: Three-fold clasp with push button release Caliber no.: 9F86 Accuracy: ±10 seconds per year Water resistance: 10 bar Magnetic resistance: 4,800 A/m 24-hour hand (dual time display function) Calendar-linked time difference adjustment function