Tony,

good arguements IMHO. For sure the 1 exec. Autavia is historical the most important model.
But from a asthetic point of view I prefer the 2. exec. dials. The subdials of the 1. exec. are from my view far "too big".
And the aged lume of the numbers it´s not my favorite, but that is personal taste...

What makes both watches interesting is that they look quite original, some would say in bad shape. So the winner will have the chance to choose how to "restore".
If I had the choice (far out of reach), I would choose the 52826, even if it´s younger one. Bezel & dial looking better on the pics.
Fortunately I have made my one in a livetime find of an Autavia (1. exe. 3646, 2. exe. dial) last year, so I can sit back, relax and see what will happen...

Georg