As Gene and Bob alluded to, Chipco chokens were made for a few Colorado casinos.

They are made out of metal, covered in full graphic enamel. They could be and were used in both slot machines and on table games. They had a tendency to jam up the slots, and the cage workers hated them because they are slippery. Stacking them for cashing them in often resulted in the things sliding all over. I know the cage workers were glad when Bronco Billy's finally got rid of all of the chokens like the one pictured below.

Bob