I bought one of each color IB at the Central States coin show. The dealer said clearly that they were a Home Play set, when I bought them. And as we all know, that may be true, or just a disclaimer because he didn't know the origins and he didn't want to misrepresent them. By the way, these were the only chips he had. He was a coin dealer.

There must be a bunch of these floating around.

I'd guess that because of the $20 they were used for poker somewhere, possible an illegal game or club, back in the 80s. They show signs of use, and unless someone played often at "home" I don't think they would be this used. WAG