Silver-clad Bicentennial quarters with the "S" mint mark are highly valuable.
Proof versions were produced in limited numbers and fetch high prices.
Error coins, like double dies or off-center strikes, significantly increase value.
Uncirculated Bicentennial quarters are much more valuable than circulated ones.
The Type I reverse design is rarer and more sought after by collectors.
Professional grading can reveal hidden value in pristine coins.
Some Bicentennial quarters contain 40% silver, adding to their worth.
Recent auctions show a surge in demand for rare Bicentennial quarters.
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