You wouldn’t know it looking at the pictures on the websites, but it seems the shades of blue are different across Aquanaut and Overseas models as they are on the different Nautilus versions.
The new chronograph version of the Aquanaut has a royal blue navy shade that is quite different and comparably understated compared to the non chrono version. At least that’s how I recall the time only, I was on a plane a few years back and someone came into the cabin with the 20th anniversary AN and it caught everyone’s attention, what with the brilliant blue and the polished and brushed case. I noticed a few people staring at it.
I might be mistaken though. I do know for a fact that the VC time only, chrono, and my new Tourbillon versions have different shades and effects. My OS T has also a dark shade of blue.
The Nautilus PC I am considering similarly has a very different shade and effect than the blue on my 5980.
An interesting strategy, certainly makes it easer to justify owning more than one version in blue!