The Patek Philippe Perpetual Calendar Chronograph 5970 is considered by many collectrs to be the perfect Patek Philippe watch. This reference bridges the gap between truly vintage perpetual calendars like the 2499 and 3970 and the more modern, hefty perpetual calendars like the 5270. At 40mm, the case size is perfect for most collectors. Introduced in 2004, this reference was a significant redesign of the perpetual calendar chronograph. The shortest production run of of this complication by Patek, only 2,800 pieces were made across all metals, making this an exceptionally rare offering. This rose gold example is in fantastic original condition and was originally retailed in 2005.