Tempore Lux racing One Moved by a Seagull ST1901 manual winding chronograph movement. 316L Surgical grade stainless steel Amazing Polished finished and a domed Sapphire crystal with a transparente caseback with sapphire crystal. 100 meters /10 ATM Water resistant DIMENSIONS 41.00 mm Case diameter 14.00 mm Case thickness 6.50 mm Screw-down crown 49.00 mm Lug to Lug 20.00 mm Between lugs DIAL Silver, Blue, Burgundy Red color Hands Polished S.Luminova C3: hands and bezel pearl S.Luminova C1: hour markers MOVEMENT Seagull ST1901 column wheel mechanical Power reserve 42 hours Frequency 21,600 vph (3.0 Hz) 21 Jewels BRACELET 316L Stainless Steel Polished finished Double safety folding clasp 20.00 mm Between lugs 20.00 mm in clasp