I don't see it listed in my parts book, but I know it's real. The first belt pulleys for the 60 didn't have the tapped holes for the puller bolts. Must be they felt it needed to be wider as well. You can also tell by the part number which part came second. When a part was redesigned, they would put an A suffix on it. (or b, c, d, etc...) During the time of the 60, H parts began with an H, but belt pulleys for all models were part #691. The 70 pulley was B-691, and got all the way up to a D suffix.

So yes, he has something quite rare. Does he have more for sale? That would look good on my 60 since it has the later pulley on it.