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November 20, 2008
Elliptical Planchet Error Coin
My last article about the clipped planchet error coin was the outward curcing clipped planchet error coin. I called it this because I really didn't know what else to call it. It's not a common error and not something I'd read about anywhere else before. However, in the last few days I managed to find reference to this type of coin error. It is known as the 'elliptical planchet error', which given the shape of the planchet is fairly self explanatory.
In the image above I've tried to explain (fairly poorly) how the elliptical planchet error occurs. The first coin blank punching operation occurs on the right, and for whatever reason, when the metal strip indexes along under the punching press after the first operation it does not move far enough and the coin blank does not leave the strip. When the next coin blank punch occurs it happens OVER the blank that is still sitting in the metal strip. This forms a crescent shaped clipped planchet on both edges, and an elliptically shapped planchet in the middle. I would guess that the crescent shaped clips do not make it through quality control because they are so small, whereas the elliptical planchet does. And of course a coin is struck on it and the elliptical planchet error coin is formed.
Australia 1961 Shilling Elliptical Planchet Error
Posted by mnemtsas at November 20, 2008 3:19 PM
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