During Watches & Wonders Shanghai, A. Lange & Sohn unveiled its latest Lange 1 Perpetual Calendar. The 41.9 mm watch is built from 950 platinum and features a sold silver diam finished in black. Its dark dial boasts a series of complications, including an outsize date, calendar function, day-of-week display, and a moon-phase display with a day/night indicator. Tonal subdials and silver hands and indexes keep the look clean and classic. An L021.3 self-winding movement with a 50-hour reserve powers the timepiece and is visible through the crystal caseback. To complete the timeless aesthetic, the watch is finished with a black alligator leather strap.