Patek Philippe Perpetual Calendar Retrograde Date Ref. 5496P-015 The Patek Philippe Perpetual Calendar Retrograde Date ref. 5496P-015, introduced in 2016, has a 39.5 mm platinum case, a silvery 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; centre seconds - 39.5 mm platinum case, 11.19 mm thick, water resistant to 30 metres - Dial: silvery, vertical satin finish, gold applied hour markers - Shiny chocolate brown alligator strap, fold-over clasp Full set. Maker: Patek Philippe. Reference: 5496P-015. Available through ELITA's private desk — verification review, discreet handling and storage. Price on request.