Nixon 51-30 Chrono More than a pretty face with a giant ego, the 51-30 Chrono is the ultimate statement piece that bridges the gap between fashion and function. With a new refined movement, it commands the room at first glance with an oversized face, boldly printed indices, and custom-molded hands. This is the OG of big-time style. Watch Size: 51mm Watch Case Material: Stainless Steel Watch Case Thickness: 15mm Watch Crystal Material: Hardened Mineral Watch Movement Type: Quartz Water Rating: 300 Meter / 30 ATM Lug Measurement: 25mm Band Material: Stainless Steel Band Connection: Screw Bar Band Type: Free Swing