This not-so-standard custom-built chronograph is a rugged balance of technical functionality and elevated style. The Sentry Chrono has a new and refined movement that's perfect for the thrill-seeking professional badass. Details Watch Size: 42mm Watch Case Material: Stainless Steel Watch Case Thickness: 12mm Watch Crystal Material: Hardened Mineral Watch Movement Type: Quartz Water Rating: 100 Meter / 10 ATM Lug Measurement: 23mm Band Material: Stainless Steel Band Connection: Spring Bar Band Type: Free Swing A1390