A tritium dial ref. 5066A Aquanaut, the first Aquanaut with a display caseback but still in the 36.5mm original size. Patek Philippe designed the Aquanaut to appeal to a younger audience, embracing sportiness and defying convention as their first watch designed ground-up to be worn on a rubber strap. Featuring a ‘grenade’ dial, Nautilus-inspired case, highly engineered ‘grenade’ rubber strap, and automatic calibre 330 SC, the 5066 defines neo-vintage Aquanaut: refined casual luxury.