It's a Componon-s. Just the one I was looking at to maybe buy new at BH.
Interesting and it would make sense that a 50mm would be optimized by design for greater magnifications.
Would a 90mm do a better job on 6x6 than a 80mm on a 6x7? Or are we starting to split hairs here? (Portuguese expression for this would be "looking for hairs on an egg".. Hahah!)