Patek Philippe Perpetual Calendar watches features a classic design that is both elegant and effortless, making these timepieces appeal to collectors, avid wearers, industry members, and journalists across the board. Patek Philippe 1518 was the first serially produced chronograph with perpetual calendar ever. Patek Philippe perpetual chronographs starts in 1986 when 3970 made its debut. Most notably, the 3970 was the first Patek Philippe not to use the Valjoux-based movement that characterised the 1518 and 2499, instead replacing it with the Lemania calibre 2310.In 2011 Patek Philippe 5270 watch in the series with an in-house movement. Featuring an all-new perpetual calendar module with 182 parts and allowing for a clear and beautifully symmetrical dial layout, this new caliber 29-535 PS Q meets the stringent Patek Philippe Seal that dictates both accuracy and finishing. Replica Patek Philippe Perpetual Calendar Watches: