|See-through case back
|Case back with 6 screws
|Box shaped sapphire crystal
|Anti-reflective coating on inner surface
|Diameter 39.5mm Lug-to-lug 46.9mm Thickness 13.1mm
|Three-fold clasp with push button release
|Automatic with manual winding
|Approx. 55 hours
|Mean daily rate:
+5 to -3 seconds per day
|Other details / Features:
The three movements at the heart of Grand Seiko
One of the world's foremost mechanical movements, the culmination of high-precision micro-engineering and the attention to detail of Grand Seiko's expert watchmakers.
Spring Drive is a unique movement that delivers one-second-a-day precision, using just the power of a mainspring.