U-Boat Swiss Made Ronda 712 Quartz Movement. Lubricated with an Oil Bath. Working between 0°/+60°C when not worn. 44mm x 15mm IP Black Plated 316L 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. Screwed In, Black PVD 316L Stainless Steel Caseback. Domed, black painted metal dial - Hands, numbers and indexes treated with yellow superluminova. 22/20mm Width Yellow Ultra-Resistant Silicon Strap with U-BOAT Logo - IP Black 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.