A quick and dirty history before we get to the good stuff: my opinions. The Aquanaut dove onto the scene in 1997 with the 5060A (A is for Acier which is French for steel, click the video to hear my simply unimpeachable pronunciation). Designed to fill a hole in the Patek Philippe line and reach a newly rich audience of collectors thanks to the '90s dot com boom (shout outs and RIP to pets dot com) the Aquanaut link was the more casual and less expensive answer to the Nautilus.