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|Case:||Stainless steel with ceramic bezel|
|Glass Material:||Double curved sapphire glass|
|Glass Coating:||Anti-reflective coating on inner surface|
|Case size:||Diameter 40.5 mm × Thickness 14,7 mm|
|Clasp type:||Triple lock with push-button release|
|Power reserve:||Approx. 72 hours (3 days)|
|Accuracy:||±1 second per day / ±15 seconds per month (average)|
|Water resistance:||20 BAR / 200 M / 660 FT|
|Other details / Features:||24-hour hand (dual time display function), 30 jewels, Lumibrite on hands and indexes, Adjustment function for time difference with calendar, Date display, Power reserve display, Stop second hand function.|
A new addition to the Grand Seiko Sport collection and not the least addition. With 40.5 mm, this model falls beautifully on the wrist. No oversized sport/dive watch make a nice size. Luminova on the hands, Spring Drive with 72 hours power reserve.
"Automatic spring drive 3-day GMT"
In 2006, just two years after the completion of Calibre 9R65, the first 9R Spring Drive movement of Grand Seiko with GMT function, the Calibre 9R66, was unveiled. "GMT" stands for Greenwich Mean Time, and uses a 24-hour hand (GMT hand) as the fourth hand on the dial next to the hour, minute and second hands.