First introduced in 1994, the Lange 1, with its signature off-center dial, is the most iconic timepiece in the A. Lange & Sohne collection. Last month in Geneva, Lange revealed the most complicated Lange 1 timepiece ever - the Lange 1 Tourbillon Perpetual Calendar. Today is Leap Day (February 29th - as it is a leap year), so it is fitting that this timepiece's perpetual calendar function automatically corrects for the extra day (apart from perpetual calendars - mechanical timepieces require the date to be manually corrected). The Lange 1 Tourbillon Perpetual Calendar comes in a 41.9 mm by 12.2 mm case, in either pink gold or platinum. Housed inside is self-winding manufacture caliber L082.1 which has 68 jewels (including one diamond endstone), 624 parts, 4 screwed gold chatons, a frequency of 21,600 vph (3Hz) and a 50-hour power reserve.