40MM Nautilus 5712/1A-001 (2019) Pre-Owned Patek PhilippeThe Patek Philippe Nautilus 5712 1A is a 40mm stainless steel sports watch known simply as the "5712" or the "Nautilus Moonphase." Sometimes, design enthusiasts will refer to it as the "Asymmetrical Nautilus." For the 5712 1A specifically, there is only one dial configuration: the iconic blue black gradient. The watch combines the Nautilus's signature porthole inspired case, originally designed by Grald Genta in 1976, with additional complications: a