Model number MK5020. Chronographs with subdials of 60 seconds, 60 minutes, and 24 hours. 1.49 mm stainless steel case with mineral glass cover. Quartz movement with analog dial. Stainless steel strap with folding clasp closure with double safety button. Case thickness: 0.49 inches. Belt width: 0.7 inches. Water resistant to 165 feet: in general, it is suitable for short periods of recreational swimming, but not for diving or surface diving. Fits size 6 3/4" wrist. (No extra links.)