U-Boat Swiss Made Ronda 712 Quartz Movement - Lubricated with an Oil Bath - Working between 0°/+60°C when not worn. 44mm AISI Black PVD 316L Stainless Steel Case Completely Filled with a Special Oil that Emphasises and Improves Legibility on the Dial - High Quality Domed Sapphire Crystal Glass with Anti-Reflection Treatment - Innovative Locking System with Quick Battery Replacement - Distinguishing Crown on Left Side - Screwed In Black PVD 316L Stainless Steel Case Back. Domed, Black Painted Metal Dial - Number and Indexes Treated with Aquamarine Superluminova - Hands Treated with Aquamarine Superluminova. Laser-engraved QR code to Provide Access to an Exclusive Digital Experience via Smartphone. 22/20mm Width Aquamarine Ultra-Resistant Silicone Strap, Personalised with the Logo of the Maison in Relief - Black PVD Stainless Steel Tongue Buckle. Water Resistant to 50M 5ATM We are an Authorised Retailer of U-Boat. We will stamp the Official Warranty Card on the Date of Purchase.