Model number: 131.63.41.21.01.001 Movement: automatic winding Band type: Strap Material (main): Stainless steel Case size: 41.0mm Case thickness: 13.5mm Total weight: approx. 109g Caliber: Cal. 8900 Power reserve: 60 hours Function: Date display Anti-magnetic Waterproof performance (nominal): 5 atm Exterior features: see-through back Color: black