: So, are all the 'horned' lug early Autavias the same case size??

I believe so, but don't own any to cross-check. There may be a difference in size between the screw caseback watches and the snap ones, though the latter have differently shaped, more angular horns. I would say the earlier case has hornier lugs but it might be misconstrued!

Have you seen and handled any of these? If not, they're not as big as you might think they are, certainly not by 2000+ sensibilities.