You may show on your outstretched hand several pennies which are dumped over into your other hand and this hand closed.  Reaching into your pocket for a small wand or magic dust you then come out and sprinkle imaginary dust or wave your wand and upon opening the hand it is now seen to not have the pennies you just poured in but several other coins or what have you which this marvelous gimmick allows.  Clever and the handling will be obvious with gimmick in hand.  Condition very fine.