Vintage T-Shirt Forum & Community Authentication Appraisals

A very worn goodwill find, with a small hole in the front of the T towards the bottom left. However, I don't know any make or size details because as you can see in the picture the shirt has no tags or other information. Any guesses about date or authenticity?

Strikes me as modern day. Whats the pit to pit? Coincidentally I saw Geddy Lee in the park today walking his dogs. I shut you not!