riddler - The Mint's machine that sorts out the incorrect size and defective blanks.
rim - The raised edge of a coin created by the upsetting mill and collar. The raised edges on both sides of a coin help protect the coin's design from wear.
Riddler
A machine used by mints that screens out planchets of the wrong size and shape prior to striking.
rim ...
Riddler: A machine that screens out blanks (planchets) that are the wrong size or shape.
Rim: The raised edge on both sides of a coin (created by the upsetting mill) that helps protect the coin's design from wear.
Riddler
A machine that filters out planchets of the incorrect size or shape.
Rim ...
Instead of being caught and discarded by the Riddlers and destroyed as a mint error, it was subsequently struck by a Roosevelt Dime obverse die. It then became an obverse die cap and took the shape of the obverse Dime die.
Another attempt is made to prevent improperly shaped coins from reaching circulation by passing them through a second riddler.
riddler - a machine that sorts out wrong size/defective blanks (planchlets) rim - the raised edge of a coin created by the upsetting mill.
riddler - a machine used in the minting process that sorts out wrong size/defective blanks (planchlets). rim - the raised edge of a coin created by the upsetting mill.
 See also: Collector, Obverse, Mint, Planchet, Struck
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