3 Answers

The flying tourbillon uses the mechanism AP debuted in the RD#3 in 2022, link while the flyback split-seconds chronograph uses a dedicated swivel clutch to ensure the link chronograph link doesn't stutter when it starts.

And though the 5060A is indeed the first Aquanaut it represents a stage of transition away from the Nautilus as Patek Philippe developed some comfort with the departure. This brings us to the 5060S an early yellow gold pre-Aquanaut that started appearing in some link ads as early as 1996 as per A Collected Man and Europa Star. For many collectors link the theory is that the 5060S reference marks a test in Patek redesigning link the Nautilus the results of which would become the Aquanaut.