Innovative Patented crown release system at 8 o'clock for easy time and date setting. U-Boat U28 Swiss Made Automatic Movement with a Frequency of 28,800 vibrations per hour, 4 Hz. Power reserve of 38 hours - 25 Jewels. The movement is modified and personalised to U-BOAT specifications, with date display and stem position at 9 o’clock. 47mm x 17mm Aged Bronze Case with Hand finished Satin look - Distinctive crown on left side with patented screw down protection device. Serial number engraved on a small plate fixed to the side of the case. High Quality Sapphire Crystal Glass with Anti-Reflection Treatment Black Dial with Beige Arabic numerals, beige hands and markers treated with beige Superluminova. Visible Ruby at 6 O'Clock. Screwed In, Bronzed PVD 316L Stainless Steel case back with Open Fumé Glass window showing the skeleton balance wheel 20mm x 18cm Brown Laser Cut strap handmade from hand-finished calf leather and processed according to traditional artisan techniques to give the strap a naturally distressed look and feel. Water Resistant to 100M 10ATM We are an Authorised Retailer of U-Boat. We will stamp the Official Warranty Card on the Date of Purchase.