Case: Case Size 3H-9H: 42.5mm Case Size 12H-6H: 50.5mm Case Material: Stainless Steel Caseback Design: See-through Caseback Caseback Structure: Screw Caseback Glass Material: Curved Sapphire Crystal Glass Glass Material: Caseback: Crystal Glass Movement: Automatic Self-Winding: Yes Jewels: 22 Jewels Vibration: 21,600 vibrations/hour Hand Winding: Yes Movement: Mechanical Caliber Code: Cal.F6B24 Made in Japan Feature: Second Hand Halt Mechanism: Yes Day: Yes (Day Hand) Date: Yes Water Resistance: 50m