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Error $20.00 1911-D Gold Saint Gaudens Double Eagle Struck Thru - Raw AU / BU

Gold errors are rare.  The US Mint was very conscientious about not releasing coins which looked defective, and particularly those which appeared to be underweight. 

This 1911-D Double Eagle weighs a full in-tolerance 33.5 grams, yet appears to be missing a fair amount of gold.  This is because the coin was struck slightly thicker than others when debris was caught in the striking chamber with the planchet.

This coin grades AU / BU.