One of the most loved modern Patek Philippe Grand Complication watches - the Perpetual Calendar Chronograph 5970P. The 5970 was introduced in 2004 in what was the shortest production period of any Patek perpetual calendar chronograph. During that period, only about 2,800 pieces were made across all metals. Ben Clymer put it well in a Hodinkee article: Ah, the 5970. Some call it the best watch Patek Philippe ever made. Some describe it as perfectly proportioned. Others call it the last of the great Patek Philippes. This example is in wonderful original condition and comes with an extract from the archives at Patek Philippe noting a 2009 sale date..