Okay, found my Mamiya stuffz.
The lens is labeled Mamiya-Sekor C 80/1.9 N, not 85mm, as I remembered wrong...
I also see I have two copies of the great Minolta 85/1.7, the older all metal PG version, and a newer Rokkor X version.
And... wait for it, my ol' Conurus EOS converted Contax 85 N ! Autofocus!
Let the Frankenstein rigged builds begin!