|See through Screw Back
|Anti-reflective coating on inner surface
|Diameter 40.0mm Lug-to-lug 47.0mm Thickness 11.7mm
|The perimeter of Band:
|Automatic with manual winding
|Mean daily rate:
+5 to -3 seconds per day
|Normal usage accuracy:
|+8 to -1 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.