Grand Seiko Spring Drive Power Reserve SBGA085

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Spring Drive

Caliber 9R65
Spring Drive
Hand winding capability
Power reserve indicator
Power Reserve: Over 72 hours
Accuracy: +/- 1 second per day
30 Jewels
High definition dual-curved sapphire crystal with anti-reflective coating
Screw case back with sapphire crystal
Screw down crown
Stainless steel case and bracelet with tri-fold push button release clasp
100M water resistant
Case Diameter: 39.0mm