Black Bay One 31 | 31mm, Steel, Diamond Champagne Dial WW25 purple-lined calf skin leather strap

purple-lined calf skin leather strap complements the dial

and a telemeter to measure distance based on the speed of sound

With a diameter of 30mm

including the bezel

Black Bay One 31 | 31mm, Steel, Diamond Champagne Dial WW25 purple-lined calf skin leather strapThe Black Bay One 31 36 39 41 models bring a unique aesthetic to the Black Bay One line. The curved cases feature a combination of finishes that elevates the watch in a contemporary fashion and offers a design language that slightly departs from the brands iconic tool watch spirit to embrace a sophisticated, versatile, unisex chic look and feel. Fitted with Manufacture Calibers these models are at the cutting edge of technical watchmaking refinement.