I thought the same way about the Aquanaut until I tried one on (as true with the Nautilus). The key things are the thinness and the case finishing. When considering the water resistance achieved, it’s quite something. Also, the potentially military origins are cool.
Well, as you probably do not know, the connections between Swiss military and the "movers and shakers" in the Swiss financial world are strong. On some forae, the dial design of the original Aquanaut has been discussed at length, revealing some details of that connection, incl. the Stern faily.