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A "frosted" Proof coin is one where parts of the pattern, usually the raised areas, have been deliberately dulled by etching or sand blasting the corresponding surfaces on the die. The finished coin then has a striking contrast of the frosted portion against the mirror like finish on the rest of the coin surface.
KG VI means King George VI. A "Matt Proof" coin is a process where the surface of the coin is deliberately finely granulated as distinct from the usual mirror like surface of "Proof" coins with frosted highlights. The flat surfaces will have a satin like appearance. FDC is an abbreviation for Fleur du Coin. It refers to a "Proof" coin that has been hand finished.
PR is used in terms of grading coins to designate that the coin is proof. For example, a perfect proof coin would be graded as PR-70. A nearly perfect proof coin might be graded PR-68 or PR-69, etc.
A "Proof" or "Proof - Fleur Du Coin" coin is one that is struck on specially prepared and highly polished dies. After the coin is struck, it is hand polished to give a mirror like finish. Most modern "Proof" coins have the highlights frosted to give a good contrast. "Proof" coins are made from the same metal as general circulation coins, but are often also made from silver or gold. "Proof" coins are worth a good deal more than their face value and are intended as a souvenir or investment.
Proof
"PL" in coin grading means "prooflike". It is used to describe a coin that has mirror fields and fine details resembling a proof struck coin but is not a true proof.
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A proof coin is made from a highly polished planchet (blank) and struck more than once to produce a highly detailed relief. Proof coins are sold to collectors and are not put into general circulation.
In coin collecting, it means Brilliant Uncirculated, a very nice coin, but not as good as a Proof coin.
It is the highest grade of proof coin
The designation "PF" for any coin means it's a Proof coin. Proof coins are given a grade from PF60 to PF70.
PR is a grading system used for proof coins