The present example is an exceptionally rare, early first-generation Patek Philippe Aquanaut, reference 5060J-013, powered by the calibre 330 SC. Cased in 18K yellow gold, it is distinguished by an incredibly rare factory golden horizontally embossed dial with 11 brilliant-cut diamond hour markers—a magnificent Nautilus-inspired guilloché pattern executed in precious metal. Confirmed by the Patek Philippe Certificate of Origin, this dial variant is regarded as one of very few known examples in the entire 5060 series.
 
The reference 5060J was introduced in 1996 as a transitional model within the Nautilus line (often called the “Aquanautilus” by collectors) to mark the Nautilus’s 20th anniversary. It officially launched the Aquanaut collection alongside the steel 5060A in 1997. These first-generation examples are defined by the pioneering automatic calibre 330 SC and the iconic porthole-style case.