Custom fitted according to measurements and matches Velez 1978 Game Worn Velez jerseys (as shown in pic from a 1978 Jays home game) from Exhibition Stadium. The fact the jersey has been customized for sizing leans towards at the very least a team issued gamer, although the markings show possible game use (although without 100% certainty) it’s listed as a pro authentic. See my other auctions for other game worn Toronto Blue Jays jerseys and pants.