Woodstock t-shirt black with purple and dates

[Kristin444]

Hello!
I am hoping I can get some information on this t-shirt.
I've had it in my possession for 25 years and originally won it in a euchre game.
It doesn't have a tag (but looks like it was originally a white one)
Wondering if it is really "authentic vintage" and what it would be worth.
Any and all info would be greatly appreciated.
Thanks in advance,
Kristin

[jimmyj]

It is vintage. But 80s...its not 60s or even 70s. Still value but I hope when you won it in the mid 90s they didnt mislead you into thinking it was original!