![]() Dies that have the "heads" (or obverse) design on them have shafts of one shape (perhaps square,) while the dies with the "tails" (or reverse) have a differently shaped shaft (perhaps round.) Since you can't put a square shaft into a round hole, this prevents the mint workers from accidentally making two-headed (or two-tailed) coins. The shaft of the dies is made to be a certain size and shape so that they will only fit into the coin presses a certain way. Mint (and most other world mints) have built-in protections against accidentally making coins that have the improper die rotation or die setup. ![]() Why it is Impossible for Two-Headed Coins to Come From the U.S. If you hear more of a "thud" than a "ring" the coin is a forgery. ![]()
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