Silver-Clad Quarters: "S" mint mark versions are worth more.
Proof Sets: Higher value in proof sets.
Mint Errors: Errors like double dies increase value.
Uncirculated Coins: High-grade quarters are more valuable.
Type I vs. Type II: Type I reverse is rarer.
Recent Trends: Rising prices in recent auctions.
Collector Demand: High demand boosts prices.
Historical Significance: Bicentennial design adds value.
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