What This Coin Looks Like (Obverse, Reverse, Mint Mark Location, Special Features, etc.): The San Francisco Mint produced a major Overpunched Mintmark (OMM) error on the 1946 S Lincoln Wheat Cent (Penny). The best way to identify this error is to note the "S" mintmark stamped on top of a subtle "D" mint mark (S/D OMM). The location of the "D" is depicted by the arrows in the example image where it is subtly seen within but under the "S" mintmark.
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