You might need to wait for Al.
They look like they could be marbles which Champion would have had on hand. If there are cat's eyes in there, Champ wouldn't have made them, but they might still have had them around. Especially in the 1970's.
Are there 21 marbles in the bag?
There are some real Champ bags, filled with real Champ mibs, but not with the permission of Champion. If I understand correctly. Champ bags are a tricky area.