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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