From the Mile High City, Denver, Colorado motorcycle rally of the late 20th century, 1992 to be exact (printed faintly on front of T). 

Men's size Large

Made in the good ole United States of America by a Union shop, so while this shirt is perfectly aged you'll get another 300,000 miles out of it easily

Happy Bidding!!

Measures:

Pit to Pit: 21.5" ish? maybe 22?

Shoulder to hem: 27"

See tape in photos for more