Stainless Steel Case, Brown Calfskin leather strap, Steel deployment buckle, Black Dial, Automatic Movement, Regular Time and Date setting functions are set by the bottom crown. Water Resistant to 100m/330ft by a revolutionary new patented design - Although the crowns are not screw down they are equipped with an external butterfly collar that turns 1/2 turn clock-wise and counter clock-wise (independently of the crown), each collar has red and white enamel indicating arrows. White arrow indicates the crown is secure/water resistant, Red Arrow indicates the crown is non-secure/non-water resistant. When the collar is in the secure position it compresses a gasket that ensures water resistance. Luminous hands and hour markers, Sapphire crystal, Solid case back. Diameter - 41.5mm, Thickness - 13.9mm.