Patek Philippe Nautilus Annual Calendar Ref. 5726/1A-001 The Patek Philippe Nautilus Annual Calendar ref. 5726/1A-001 shows day, date and month, needing correction only once a year, with a moon phase and 24-hour display on an embossed dial shading to black. The reference is no longer part of Patek Philippe's collection. - Self-winding Calibre 324 S QA LU 24H (later 26-330 S QA LU 24H) - Annual calendar with day, date and month; moon phase; 24-hour display - 40.5 mm steel case, water resistant to 120 metres - Black-gradated dial, horizontally embossed - Integrated steel bracelet with Nautilus fold-over clasp Full set. Maker: Patek Philippe. Reference: 5726/1A-001. Available through ELITA's private desk — verification review, discreet handling and storage. Price on request.