|Case back:||Screw case back|
|Glass Material:||Dual-curved sapphire crystal|
|Glass Coating:||Anti-reflective coating on inner surface|
|LumiBrite:||Lumibrite on hands and index(es)|
|Case size:||Diameter 39.0mm Lug-to-lug 46.0mm Thickness 12.1mm|
|Clasp type:||Three-fold clasp with push button release|
|Caliber no.:||9F86 Instructions|
|Accuracy:||±10 seconds per year|
|Water resistance:||10 bar|
|Magnetic resistance:||4,800 A/m|
|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.