Only the U.S. Mint can tell if your money is fair and square!
As you show the spectator a half dollar, you explain that you would like to warn them about a few counterfeit coins which are circulating the country. The only way to tell if they are fair and square is to bring them to the U.S. Mint. You proceed to show a roll of breath mints with which you use to tap the coin. The Half Dollar VISIBLY changes into a square half dollar which you now explain is, fair and square!
Includes everything you need to perform this easy-to-do miracle: roll of mints, custom-cut square coin, and the special gimmick. Made in the USA.