Patek Philippe Perpetual Calendar Retrograde Date Ref. 5159J-001 The Patek Philippe Perpetual Calendar Retrograde Date ref. 5159J-001, introduced in 2007, has a 38 mm yellow-gold case, an opaline white dial and the self-winding Calibre 324 S QR. The reference is no longer part of Patek Philippe's collection. - Self-winding Calibre 324 S QR - Perpetual calendar with retrograde date hand; day, month and leap year in apertures; sweep seconds - 38 mm yellow-gold case, 11.8 mm thick, water resistant to 30 metres; officer's-style case; sapphire-crystal case back under a hinged dust cover - Dial: opaline white, hand-guilloched centre - Matte chocolate brown alligator strap, fold-over clasp Full set. Maker: Patek Philippe. Reference: 5159J-001. Available through ELITA's private desk — verification review, discreet handling and storage. Price on request.