Vintage T-Shirt Forum & Community

This one is tricky. Bought it at a thrift store a number of years ago. No idea if it's actually vintage, a repro, from the tour or reprinted later, or what. I know if it's authentic it's worth some $$ but I really have no idea. It's in okay shape--got some light pit stains and a small hole near the hem, a little bit of cracking on the graphic. The front of the tag is blank and the back is how it looks in the close up attached.

Odd tag - Canada and a phone number. Can you make up what's before 866? I think it's vintage - whether or not it's a headshop bootleg or not I'm not sure. What's the pit to pit?