tooling mark A line, usually small and fine, found on both genuine and counterfeit coins. On genuine coins, such lines result when Mint workmen touch up dies to remove remnants of an overdate or other unwanted area.
tooling mark
A line, usually small and fine, resulting from a reworking of the die to remove unwanted elements.
transfer die ...
On most examples of this altered coin, you can see the tooling marks that removed the portion of the first 4. If you can not see the tooling marks, then usually there is a lower field between the 9 and the second 1.
The lack of tooling marks in the modified areas are consistent with "tooling" in the form of modification to the wax prior to casting.
867 1868-S VF-35. Very light yellow gold with tooling marks at top of Liberty's head.
From Stack's sale of the Miles Collection, October 1968, Lot 870.
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I'd be cautious though. It's possible the shield has been re-engraved and then had the desert patina added to hide tooling marks. I wouldn't accept it as a true variety until the dirt is removed from around the lettering.
Steel cents are attracted to a magnet, copper cents aren't.
Compare the digits on a 1943 steel cent with your coin. The shape of the digits should be the same and there should not be tooling marks where empty space would be on the"3".
 See also: Marks, Coin, Obverse, Mint, Copper
  
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