The Patek Philippe Perpetual Calendar Chronograph White Gold Silver Dial 41mm Ref. 5270G-001 marks a milestone as the brand’s first in-house perpetual calendar chronograph. Introduced in 2011 and produced until 2013, this reference features a 41mm white gold case and a silver dial with black gold index markers. The dial layout delivers clear displays for the perpetual calendar, moonphase, day/night indicator, and chronograph functions, omitting a tachymeter scale for a cleaner look. Powered by the manual winding Calibre CH 29-535 PS Q, the watch offers a 65-hour power reserve and column wheel chronograph mechanism. The sapphire crystal caseback highlights the movement’s finishing. Paired with a black alligator leather strap and a white gold folding clasp, this model is water resistant to 30 meters. Key features include its in-house chronograph movement, perpetual calendar complication, and distinctive dial configuration, appealing to collectors of high-complication Patek Philippe watches.