Stack's Bowers - To err is human, it is said. And when the Mint makes an error that can be divine. In 1822 a Mint engraver was working on the reverse die for a silver coin. In a moment of forgetfulness, or perhaps after too many sips of rum (a popular libation for Mint workers of the time), he thought he was preparing a half-dollar die. On the reverse, he added the figures 50 C. Oops! This was a small-diameter die intended for a quarter dollar. He then overpunched the 50 with 25, but left enough of the error visible that it is easily seen today. Thus, one of the most famous early silver coins.

As might be expected, this variety is desirable in any grade. Even a well-worn example would attract attention. The D. Brent Pogue Collection coin is a gorgeous Proof-65 Cameo (PCGS)!
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