We're in the outskirts of Toronto but that definitely goes with what my gut was saying for it. Matches with some other headshop shirts he had as well. Thanks for the input!

Got this out of my uncle's closet along with some crazy fantasy/wizards shirts, and all his union/sports/drinking shirts.
Only tag that remains does not have a brand, but it does state Made In Canada, which is where we live.
Thoughts on authenticity? I can't find reliable comps with this imagery ...