This patch is made of felt -- a common material for patches at the time, but much less used now. (It's also prone to being eaten by moths, hence the holes in this one.)
Judi was beloved by her fans, hence why they formed a fan club / following. I asked a number of old time roller derby aficionados and got the following information from them: Born June 23, 1940 in Peekskill, NY, Judi won state speed championship at 15, then won again at Nationals. Followed flat-track skating pals Mae Hansen & Pete Mangone into Derby. Selected for Training School at 9th Regiment Armory. Trained by Gerry Murray, emulating the legend's skating style. Married Murray's son, Mike Gammon. From the start, Judi was a giant on the banked track, never backing down from larger or more experienced skaters. All-Star in '65 & '66, again throughout the 70s as number one female scoring star. Playoff MVP '66 & '71. Joined National with husband Mike when the Warriors came East in October '67. Returned to Derby in '69 with Mustangs & Bay Bombers. Skated national tour with Bombers, with Cardinals during the regular season, before becoming the centerpiece of newly-reorganized Chiefs in Fall of '71. Continued being an exciting skating star, one of the greatest distaff scoring stars of all-time, thru the end of the 70s. Widow of Charlie O'Connell. She is still living and answers fan mail. She's 80 years old as of 2020.