SLX tubing? At oldest...probably 1985 would be my guess.
The writing on the front calipers are the older ones .. something like pre-mid/late 80's when they changed to script.
The 1A stem was a biaatch to put on. Can you see the scratches on the bar on the left side of the bar?
Those are some pretty tough wheels he had. He probably was thinking of riding some rough roads.
Pretty nice though. You'd have to stretch the rear dropout if you want to ride a 9 or 10 speed. But you are in NYC right? Biggest hill is Prospect Park and 110th street in Central.