Coin Back Palm
Coin Back Palm is a type of Coin Concealment.
T. Nelson Downs, the "King of Koins," back palmed coins extensively in his vaudeville act. Photographs of his hand with what appear to be about 15 coins back palmed can be seen in his book Modern Coin Manipulation (1952). This is a false explanation: apparently he never back palmed that many coins in his act. A gimmick that he used, known as the Coin Spider (a coin from which pins protrude on either side with metal pieces so it can be back clipped) was used by Downs and is pictured in The Magic and Methods of Ross Bertram (1978).