U Boat Diver Watch Automatic Sommerso Ceramic Bordeaux MT Case Colour_Two Tone ensuring durability and style ensuring durability and style The screw down crown and solid case back add to its robust construction Polished Finish on the Central Links and Matte on the Sides Links with Screw in Adjustments Instead of Pressure Pins The Smoothed Finishing gives you a Perfect Fit and Comfort Deployment Clasp with 3 Easy Micro Adjustments and U Shaped Detail Laser Engraved Logo on the Two Final and Initial Links Width 22 20mm 46mm x 16mm AISI 316L Stainless Steel Case Distinctive Crown on left side with Patented Screw Down Protection Device Uni Directional Bezel Serial Number Engraved on a Small Plate Fixed to the Side of the Case High Quality Sapphire Crystal Glass with Anti Reflection Treatment Solid Caseback