Patek Philippe. A Rare and Important Yellow Gold Perpetual Calendar Wristwatch with Moon Phases, with Certificate of Origin and Original Purchase Receipt InvoiceModel: 3448Movement No: 1'119'136, signedCase No: 325'492Year: 1970Calibre: 27-460 Q automaticDial: Silvered, perpetual calendar date and month in German, signedCase: 37mm, 18k yellow gold, screw back, signedStrap: Endangered species, signedAccompaniments: Certificate of Origin, purchase receipt invoice and Patek Philippe Extract from Archives注脚百達翡麗，3448型號，罕有重要黃金萬年曆自動上弦腕錶，配月相顯示，年份1970。附證書、當年買入收據及候補資料庫精萃。Patek Phillipe presented the world with its first Perpetual Calendar wristwatch in 1925. In 1962, Patek Philippe released Reference 3448, an automatic Perpetual Calendar wristwatch, and the popularity and demand for such style drastically increased after the release. Reference 3448 is one of the most elegant and wearable Patek Philippe timepieces. The simplicity of a Calatrava meets the complications of a Perpetual Calendar. For Reference 3448, there were only 589 examples made including 450 pieces in yellow gold, and the production of the watch ended in 1981.The watch is fitted with a patented Patek Philippe 27-460Q calibre. The perpetual calendar is elegantly presented in 37mm a very oversized slim case designed by Antoine Gerlach. Asides the case design, the lugs unlike anything designed at that period. They were angular and sharp, and they gave off a crisp, clean vibe and it became an instant classic.The presented example was manufactured in 1970 and with crisp original hallmarks on the case. Also, it comes with the Certificate of Origin, Purchase receipt and Patek Philippe Extract from Archives. This stunning timepiece is much sought after by the top watch collectors of the world.