A Spring Drive GMT for the next generation
Equipped with a GMT hand, this watch features the unique Spring Drive calibre of Grand Seiko, which combines the power of a drive with the high precision of a quartz watch.
Housed in a water-resistant stainless steel case of 40.5 mm with ceramic bezel, a 24-hour GMT hand and Lumibrite indexes for exceptional precision and readability, complemented by the smooth motion of Spring Drive with 72-hour 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.