Urwerk reveals the third iteration in its 220 collection with the UR-220 SL "Asimov." The watch features an 81-layer Carbon CTP case that houses its signature arrangement of satellite hours that have been molded in Swiss Super-LumiNova Grade X1 BL. The minute track has also been finished with a luminescent coating as well as the power reserve indicators. The watch is powered by Urwerk's Caliber UR-720, a manually-wound movement with a 48-hour power reserve. Completing the watch is a Vulcarboné cured rubber strap with a DLC-coated buckle and Velcro fastener.