A "Farmall" Hydro 86 would've had a 2250 or 2350 Mount-O-Matic to be "period correct" if I'm not mistaken. Being an industrial tractor, things are definitely different.
That loader looks more like a 2000, but not quite. I'm sure IH made different models of loaders between the 2000 and the 2350, but my knowledge of IH implements from the mid-late 70's is about as fuzzy as my memories of that era. Most of the equipment I grew up operating was from the 1960's, and the stuff Dad's using now is still mostly from the '60s and early '80s. The 1066 is the only thing he has from the 1970s.