OS Retro Chronograph Dubois-Depraz Pulsometer Stoppwatch with Tachy- and Pulsometer indication. Limited edition of 100 pieces only! Reference 8560BH-f1-Puls Case Diameter 47.5 mm Dial color black Movement (Type) automatic Movement (Caliber) Dubois-Depraz 2025 Case Material stainless steel Case Surface matt Water Resistance 5 ATM Glass sapphire crystal Case Back glass back Band leather strap Origin Swiss Made