PJ is my favorite band by far, but they were more meaningful for sure in my 20s...less so now.
Rock memorabilia is tough sledding. There are prolly more forgeries in that arena than sports. Having said that Vedder stuff do come up, I would never buy Nirvana stuff unless it's heavily provenanced.
I do have this signed PJ Ten cd cover by the 5 members during those touring days.
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