Quote Originally Posted by E. von Hoegh View Post
Those holes in the coupling prong mean nothing, because prongs can be swapped from lens to lens. It's the step milled in the aperture ring that makes it Ai or not.
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.