MWC Swiss Made 500m (1640ft) Water Resistant Automatic Divers Watch in Black PVD Stainless Steel With Sapphire Crystal, Ceramic Bezel and Helium ValveSKU Code: CH 500M PVD BL The MWC 500m Water Resistant Divers Watch with Helium Escape Valve is part of MWC's elite range, offering superior durability and functionality for professional divers and challenging environments. This model, finished in covert non reflective PVD steel, features an impact resistant sapphire crystal and a scratch resistant ceramic bezel. It is suitable for all settings, from office environments to extreme outdoor activities.