Quote Originally Posted by benjiboy View Post
You are right , but the cut outs only came out with the advent of auto indexing in Nikkors, and the lens looks to be a safe bet because it looks to be one of the newer types and of the right vintage, when Nikon modified the old lenses to Ai they changed the "rabbit ears" to the ones with cut outs, and I can't see anybody bothering to change it otherwise, I would buy this lens without hesitation.
Safe bet? The notch in the aperture ring as well as the extra scale of aperture numbers on the ring are clearly shown in the photos.....and I have a pre Ai (and unmodified) 20/3.5 Nikkor UD with a perforated coupling prong, so they did make their way onto the "wrong" lenses.