Model number: NA2431113-00 Case: Material: Stainless steel Size (approx.): 48mm diameter Weight (approx.): 110g Belt width: 25mm Material: Leather Clasp: Pin buckle Windshield material: Hard mineral crystal glass Water resistance: Water resistance: 100m I used this in high school! I used it for about a year! Battery is dead. We are looking forward to your purchase if you understand this!