The 21 Cent Trick (US) with Bang Ring - Kueppers

4 coins are shown on a table. One at a time the coins are placed under a playing card, as the spectator adds the value of the coins. When all 4 coins are totaled and under the card, one coin is removed and subtracted from the total remaining under the card. The card is then flipped over to amazingly reveal that not 3 or 2 or even 1 coin remains! 3 coins have VANISHED! The existing coin can be handed out for examination. All 4 specially machined coins are included along with full instructions and routine(s).