Vostok-Europe Men's 'Lunokhod' Swiss Quartz Stainless Steel and Silicone Sport Watch, Color:Black (Model: TM3603/6204187) Split second chronograph with 31 day summing Two time-zones Helium release valve 13 tritium tube that stand-up in "candle" holders plus two additional tubes. Enhanced hardened mineral k1 crystal Water resistant to 990 feet (300 M):suitable for scuba diving to a depth of 30 meters for up to 2 hours