I can find no information on the the patch or the product line. It remains a mystery.
1994 Honoring Baseball Legends Roberto Clemente Framed 1984 Stamp & Cloth Patch
100% Polyester Double Knit.
ROBERTO CLEMENTE Pittsburgh Pirates YELLOW #21 DUEL PATCH SEWN JERSEY NWT XL
Willie Stargell and Willie Horton 1970 cards deemed perfect - Sports Collectors Digest
A Mystery Surrounding the Roberto Clemente '21' Patch
Mystery Ink 10X Mixed Edition Mystery Box - 10 Autos or Jersey Relics or 1 of 1 Cards in Every Pack!
50 years after his death, family and friends honor Pirates star and humanitarian Roberto Clemente — 'part of the soul of everybody in the city' - Pittsburgh Union Progress
2023 Pittsburgh Official Visitors Guide by VisitPITTSBURGH - Issuu
Iron ON Patch. Worn on Sep 15, 2021 by Nominees.
ROBERTO CLEMENTE Patch #21 Patch Baseball Jersey PATCH PIRATES PUERTO RICO 21
A Mystery Surrounding the Roberto Clemente '21' Patch