A person
who devotes his professional life to the study of coins is called a numismatist.
A coin die is a metal stamping tool engraved with
the negative of a design, from which the positive image is transferred to the
coin blanks during minting.
A planchet is a prepared disc-shaped metal blank
onto which the devices of a coin image are struck or pressed. The metal disc is
called a blank until the time it passes through the upsetting machine
which causes the rim to be raised. Once it has a rim, the disc is called a planchet.
The collar is a part of the coin die apparatus that
holds the coin planchet in place while the coin is struck. On all coins except
the Presidential Dollar coins, the collar applies the edge to the coin during
the actual striking, whether the edge is simply plain (like a penny or nickel)
or reeded (like a dime or quarter.)
A coin blank is the metal disc onto which a coin
will be struck. The blank is punched in its round form from a strip of machined
coin alloy, and then processed through the upsetting mill, which raises
the proto-rims on the blank and turns it into a planchet.
The Reeded edge of a coin is the series of grooved
lines that encircle the perimeter of some U.S.
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