Case: Case Size 3H-9H: 41mm Case Size 12H-6H: 48.3mm Case Material: Stainless Steel Caseback Design: See-through Caseback Caseback Structure: Screw Caseback Glass Material: Sapphire Crystal Glass Glass Coating: Anti-reflective coating glass Glass Material: Caseback: Crystal Glass Movement: Automatic Self-Winding: Yes Jewels: 24 Jewels Vibration: 21,600 vibrations/1 hour Hand Winding: Yes Movement: Mechanical Caliber Code: Cal.F6F44 Made in Japan Feature: Power Reserve Indicator: Yes(50H) Second Hand Halt Mechanism: Yes Water Resistance: 100m(10bar)