1922 No D Lincoln Wheat Cent Nickel Mint Error Image
1937-D Three Legged Buffalo Nickel Mint Error Image

Filled/Polished/Over-Used Dies
1937-D Three Leg Buffalo was caused by an over-used die being polished at the mint.
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Most over-polished dies come from the Denver Mint in Colorado and most of the examples are missing part of the coin's normal design. They also display "abraided" die characteristics (from over-use) because these Mint Errors were the result of the Denver Mint, extended the life of the working die, to save money.

So mint employees would file and polish the dies. Often, this resulted in some areas of the die to be poorly struck and missing certain parts of the coin's design.
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1922 No D Lincoln Cent was caused by an over-used die being polished at the mint.
   VG      F       VF     EF     AU 
$1175 $1423 $1710 $3334 $4504
AG3     G4   VG8    F12    VF30     EF45    AU55
$250  $299  $345  $431  $1,265  $2,070  $2,450
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