Proof Sets
Silver and Clad proof sets featuring quarters from the US Mint including the US State quarters from 1999 through 2008, the 2009 US Territories proof set and the 2010 National Parks quarters proof set.
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What makes a proof set so special?
Proof sets are coins specifically minted to be showcased and collected. The number of proof sets are limited, not mass produced like the coins that are to be released into circulation through banks,
The following excerpt is straight from the United States Mint website and explains why proof set coins are nicer than coins minted for circulation:
"United States Mint proof coins are extraordinarily brilliant, with sharp relief
and a mirror-like background. Their frosted, sculpted foregrounds give them a
special cameo effect. Proof blanks are specially treated, polished and cleaned
to ensure high-quality strikes. The blanks are then fed into presses fitted with
specially polished dies and struck at least twice to ensure sharp relief. The
coins are then packaged in protective lenses to showcase and maintain their
exceptional finish."