Miyota 6S21 quartz movement with chronograph and date functions Stainless steel case Case diameter: 47 mm Case height: 16 mm An enhanced hardened 3.5 mm thick mineral K1 crystal Water resistant up to 20 ATM / 200 m 21 tritium tubes on the dial and hands: 4 Hairlights (ultra-thin and ultra-bright tritium tubes) on hour and minute (2 pcs. on each) hands and 1 hairlight on the second hand. 16 tubes on the dial ring mounted in reflectors Custom leather or silicon strap An original construction heavy duty stainless steel buckle