If you’ve followed my blogs in the past few years you know that I’m a Coin Purtist. I tend to be particularly pure when it comes to “no grade” coins. Loosely defined, a “no grade” is a coin with a problem (or problems) that preclude it from getting into a regular PCGS or NGC holder. This can range from harsh cleaning to scratches to rim damage to a hole.   
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Anyone with a passing knowledge of United States gold coinage is aware of the three rarest issues from the San Francisco mint: the unique 1870-S Three Dollar gold piece, the exceedingly rare 1854-S half eagle and the very rare 1854-S quarter eagle. But not everyone realizes what the next rarest gold issue is from this mint. Read on for the answer. The rarest collectible gold coin from the San Francisco mint is the unheralded 1864-S half eagle.   
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Think you know the Liberty Head half eagle series pretty well? OK, then here is a test. Everyone (well, almost everyone…) knows that the extremely rare 1854-S is the rarest single issue in this long-lived series. But what is the rarest collectible date ? The answer and some interesting analysis can be found below. So have you given some thought to this question?   
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