I wouldn't make any judgements until your RV-6 arrives. I, too, wanted one from at least pre-1975 but mine is probably 1979-80 vintage and performs like a champ. My eyepieces are labeled CRITERION, not BAUSCH & LOMB.

Also, keep in mind that some of the RV-6 owners moved up to the cat line so the eyepieces could easily have been swapped between the two since I'm pretty sure they differed only in the labeling. I think you'll be happy with the optical quality. It's rare to find a poor RV-6 mirror.

-Tom