Editor's note: This is one in a
series of Coin World Collector Basics posts on numerous
types of planchet errors.
Often, though erroneously, called a "clip," an
incomplete planchet results from a mishap in the blanking process. If
the planchet strip does not advance far enough after a bank of punches
rams through the metal when producing planchets, the punches again
come down and overlap the holes where planchets were already punched out.
the overlapping takes place, there is a curved area that appears to be
"missing" from the planchet. If the strip slides to the side
too far and the punches overlap the side of the strip, the missing
area is straight. If the punches overlap the end of the strip, the
missing area is either ragged or straight, depending on whether the
end of the strip was trimmed.
word "clip," commonly used, suggests a piece of a complete
planchet was cut off, which is not the case — these error pieces are
incomplete to begin with. "Clip," when accurately used,
refers to the ancient process of cutting small pieces of metal from
the edges of precious metal coins for the bullion; that is why U.S.
gold and silver coins have lettered or reeded edges, to make it more
difficult to clip a coin.
incomplete planchet errors have a "signature" known as the
Blakesley effect. The area of the rim 180 degrees opposite the missing
metal of the so-called "clip" is weak or nonexistent. During
the rim-making process, the lack of pressure in the upset mill at the
"clip" results in improper formation of the rim on the
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