Thanks Greg, it's an AI-S but I think the AI and AI-S are optically identical. Wasn't planning on buying any Nikkors but I found two deals on the 20/3.5 and the AI 200/4 which were just to good to pass up. Got the 20/3.5 near mint for €57 shipped and the 200/4 for €15 shipped. I like both. The 20/3.5 is tiny so easy to keep in the bag.
Nice Rock & Roll shoot by the way