This shirt came from the estate of Charles "Case" Leeuwenburg, who passed away on July 5, 2019, after spending years on NASCAR and Indy pit crews, mostly for AJ Foyt Enterprises (that's Mr. Leeuwenburg at the far right in the photo above).
Not a fan shirt, this was part of Mr. Leeuwenberg's personal collection of memories from his days and years working on pit crews.
This one has a few grease marks.