SIHH 2013 is in full swing and A. Lange & Sohne is not pulling any punches. ALS has announced the new 1815 Rattrapante Perpetual Calendar, and it looks to be a complete knockout. Featuring a new Lange calibre, the L.101.1, the 1815 Rattrapante Perpetual Calendar combines some of the most sought after complications into one dazzling package that has been designed as a tribute to early A. Lange & Sohne pocket watches.
The L.101.1 movement, which consists of 636 separate parts, incorporates a rattrapante or split-seconds chronograph, a perpetual calendar, moon phase indicator and power reserve display. The L.101.1 is ALS's eighth in-house chronograph movement and sports dual column wheels, 43 jewels and a power reserve of 42 hours. As is the case with perpetual calendars, this ALS will accurately measure the date to 2100, at which point a one-day correction will need to be applied. Thanks to the unique way in which the Gregorian calendar is balanced, every 400 years we omit a total of three leap days. Years that end in "00" but are not a clean multiple of 400, do not have a leap day. The year 2100 does not have a February 29th, so anyone lucky enough to have an ALS like this one in their possession will need to correct the date. This is likely only going to be a problem for the youngest of ALS collectors (looking 87 years down the road) or for the fortunate few who will be willed such a mechanical marvel.
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