Coin collection is big business for those ... Francisco facility and a single Denver mint specimen. These rare wrong planchet errors began to surface in circulation in the late 1940s, confounding ...

A "die error" coin means the coin is effectively a misprint, and though it made it into circulation it's a rare find and ...

blank pieces of metal used to make coins. Planchet errors mean they might have the wrong shape or thickness, or no engraving at all Strike errors: A coin’s “strike” refers to the step in the ...