U-Boat Swiss Made Ronda 712.3 Quartz Movement. Lubricated with an Oil Bath. Working between 0°/+60°C when not worn. 45mm x 15mm 316L Black DLC Stainless Steel Case Filled with a special Oil which emphasises and improves legibility on the dial. High Quality Domed Sapphire Crystal Glass with Anti-Reflection Treatment. Innovative Locking System with Quick Battery Replacement. Double crown on the left side, one for the time adjustment, the other for the second time setting. Screwed In, 316L Stainless Steel case back Black Dial with Rotating Inner Bezel, Beige Luminova Indexes and Hands. Second time zone numerals and hand in red color. 22mm x 20cm Black Vulcanised Rubber Strap with U-BOAT Logo - 316L Stainless Steel 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.