Real Rockwell Hardness Test Marks on Coin
From the comments in a subject titled "Can you tell real Rockwell Test" discussed in January 2019, it was evident that the Numismatics Society does not know what to expect, in case where a penchant with a Rockwell Test indentation, instead of being discarded, but is mixed into penchant batches, and subsequently put through the minting process, in the resulting coin. When a penchant is struck by dies, the planchet metal flows into the shape of die design. Because of the plastic deformation and metal-flow, it is expected that the pre-existing Rockwell indentation, which is spherical, not only will be changed in its shape, depth, and size, but also affect the design features on the coin. These changes will vary depending on the Rockwell test location on the coin design. The indentation could disappear, if metal fills it completely. Many factors affecting the final outcome on the coin makes it hard to positively identify the Rockwell test mark on a coin. However, it is expected that the mark will be extremely difficult, if not impossible, to simulate manually on an existing coin, for the plastic deformation occurring during the die strike, a natural phenomenon, cannot be easily duplicated manually on a minted coin. A photo taken from a 1944 wheat penny is shown below. Could you see the altered T and R, somewhat faint and bigger than the normal size, inside the surface of the indentation? It appears also that the indented area got bigger than the original one existed before die striking. Can those be simulated manually on an existing coin? I think not. Therefore, it can be concluded that it is a real Rockwell Hardness Test Mark produced by use of defective penchant, and not by post-mint damage.
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