Patek Philippe 3970ER Perpetual Calendar Chronograph 4th Series Rose Gold NOS

The Patek Philippe 3970ER Perpetual Calendar Chronograph in its fourth series configuration stands as a definitive achievement for the Genevan manufacture, succeeding the legendary Ref. 2499 and embodying the pedigree of high complications. Encased in warm, 18K rose gold with a refined silver dial, the 3970ER reveals balanced proportions at 36mm, gathering the most celebrated complications—chronograph and perpetual calendar—into one harmonious whole. This series, produced through the late 1990s into the early 2000s, showcases subtle but important technical upgrades over its predecessors, including: a sapphire display caseback, faceted hour indices, baton hands, and modernized dial printing - ushering a new era for the classic Lemania-based CH 27-70 Q movement. Its discreet day and month apertures, moonphase, leap year and 24-hour indicators communicate information with visual clarity while exuding timeless elegance. Collectors covet the 3970ER for its landmark position as the last manual wind perpetual calendar chronograph by Patek Philippe before the shift to in-house calibers, securing its status as an heirloom reference for connoisseurs. The rarity of this configuration, with immaculate hallmarks and preserved case lines, only augments its stature within the Grand Complication lineage, making it a formidable acquisition for those pursuing the pinnacle of Patek Philippe craftsmanship and heritage. The 3970ER embodies both the closure of an illustrious era in traditional horology and a cornerstone of value in the world of high-complication wristwatches. Like New with original Patek Philippe box, additional solid caseback, setting pin, and papers dated February of 2000. This particular example appears to be seldom worn in near New Old Stock condition.