To celebrate its 175^th anniversary, on 13 October, Patek Philippe pulled out all the stops and presented the most complicated wristwatch of its collections to date. Among the 20 functions proposed, two are unprecedented world firsts: firstly, an acoustic striking alarm, reproducing the full tone sequences of the minute repeater, and including programmed alarm time; secondly, an on-request date repeater, which sounds a double high-low strike at ten-day intervals and a high strike for the other days. The 18 other complications, including a grande and petite sonnerie, a minute repeater, an instantaneous perpetual calendar with 4-digit year display and a 2^nd time zone, are interspersed over the two faces of the reversible 47.4 mm diameter case, which is 16.1 mm thick. Over 100,000 hours of work were required to develop, manufacture and assemble the 1,580 components – including 214 for the case alone – of this model, limited to 7 pieces. Price not disclosed