Probably the Radio Stars, Eddie and The Hot Rods and Buzzcocks ones from around ’76/77. I’ve got a Stones one from their ’82 Bristol gig as well, and I’ve seen American versions of the same shirt going for something like $250 on Wolfgangs Vault. Had a Clash and a Jam shirt from the same period but gave them to a mate’s daughter, which I rather regret. Trouble is, early tour tee’s used iron-on graphics which used to crack and fade really quickly, I had a Zeppelin Physical Grafitti tour shirt, but the graphic started to peel off after a couple of months, sadly. It was only when silkscreen graphics came in with the punk bands that shirts were worth having. Prior to that I bought programmes, like the Dark Side Of The Moon tour comic Floyd did.
Wonder what that might be worth… ;0)