Vintage Cast Iron Book Of Knowledge, Reproduction ‘Ole Puffer' Bulldog Bank. Vintage Book of Knowledge cast iron reproduction. ‘Ole Puffer' Bulldog bank. When you push his tail down, the head moves and the mouth opens for a nickel! He's wearing a studded collar, and a green hat. He's also smoking a cigar while sitting on a blanket draped box, marked Cigar 5c Nickles Heavy and still works, (mechanism isn’t too tight, I’m just not left handed and not doing it on a sturdy surface for video). Opening on bottom uses a screw driver or knife to open, intact.