Tourbillon.??The complication that counteracts the effects of gravity to improve the accuracy of watches. An opening in the dial allows you to admire this mechanism as it rotates.Case Material:??Red GoldCase Diameter:??45 mmCase Thickness:??14.75 mmWidth Between Horns:??23 mmBezel:??Unidirectional rotatingCaliber:??25AStrap:??Black Sail-canvas fabric; pin bucklePower Reserve:??192 hoursWater Resistance:??30 bar