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F requentlyA skedQuestionsWhat are proof planchet errors?This type of error has only occurred on modern coinage. The Philadelphia <strong>Mint</strong>prepares the proof planchets which are then sent to San Francisco or West Pointfor striking. A few proof planchets were accidentally mixed in with the regularblanks, and struck by regular dies. Several 1999 SBA dollars have shown upthat are either broadstruck or off-center on proof planchets, but struck by regulardies. These coins have extreme proof-like fields and a pitted appearance on theunstruck portion of the blank. These are the characteristics that distinguish thisrare and unusual type of mint error.Page 134minterrornews.com
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