These were inserted into Beckett issues. They exist for multiple sports, I have some for every sport except Hockey, and they may exist for them as well, but just not in my collection. As they were issued one per magazine, at random, it would be very tough to complete any of these sets. Occasionally they would insert some of the Baseball ones into the basketball and racing publications as well.
VERY slow trading due to health problems. Not transferrable so safe to trade with, just moving is painful and can't always access the cards.
Cardboard History My COMC
New Collection Website: Cardboard History Gallery (Still under construction)
Tips on how to make your scans look like the card does in hand (No more washed out, fuzzy scans!):