Vintage Rare Property of Bronx Everlast‎ Do Not Remove From Locker Room Shirt

I've had this item for about 1-2 years sitting in my storage unit I try to do research time and time again on this piece but can't find anything on it anywhere on the internet. I'm listing this at a very high price because i can't find anything else like it very willing to negotiate on it unsure if it's worth that much. Item does have stains and is very heavily used due to age and other things.