A "Proof" coin is one that is struck on specially prepared and polished dies.
A "piedfort" coin is one that is struck on a planchet (or blank) of double thickness.
"FDC" means "Fleur du Coin" and usually refers to a "Proof" coin that has been polished giving it a mirror finish.
A coin described as "Proof piedfort in silver FDC" is a silver coin of double the usual thickness, struck on polished dies and the coin further polished, usually by hand.
A "Matte" (or frosted) coin is one that has the highlights very finely granulated. This is often done to "Proof" coins so that there is a vivid contrast between mirror finish of the flat surfaces and the raised parts of the design.
This is why such coins are usually much more valuable than their untreated counterparts.
They are made almost exclusively for the collector market.
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