The Who's Next tour was in 1971.He used SG specials all through 1971 apart from at the very end of '71 where he first started using the Deluxes for a few numbers along with the SG's!I saw the Who in Tucson AZ back in the 70's/80's (I think it was the "Who's Next" tour, whenever that was), and Pete used a beautiful burst for most of the show. When it came to the first encore, he switched to an SG, and of course that's the one he bashed to death at the end. Problem was they were induced by the crowd to come back for a second encore, and he came out with the nice LP (not a Deluxe) again, at the end he lightly tossed it in the air, and accidentally dropped it when it came down. The headstock broke, and he looked at it in disgust for a second, then proceded to break it to pieces.
I later talked to a friend that worked the show, and he said that Pete never meant to break the LP, it was a nice vintage one, and he was so pissed that he had dropped it that he went nuts and continued to smash it to hell. He usually at that point only broke the SG's, for one reason they were plentiful at the time and easier to break. I don't know if this story ever made it into a book about Pete or the Who, but you could tell he was not happy at all about breaking the LP.
Al