As a kid my dad took me to many spring training games in the 80s in Florida. Players often wore the white Mims Wristbands either in batting practice or games and opted to give them away easier than the primary colored ones. Not always but it was a trend. So in my listing if I say they are game worn it means I know it because I got them from the player, clubhouse guy, or even the bus driver. I say that because the Pirates bus driver went into the clubhouse a few times and came back with Wristbands for me. No, I don't have a certificate of authenticity because back then when they handed you a wristband they didn't also hand you a certificate of authenticity as well.
Got this one in Plant City prior to the last home game of the spring. Barry came out with his fielding glove full of his Mims Wristbands and tossed them over the fence on his way to the dugout. This is the only one I got.