1999 Delaware Quarter: Doubled die errors add value.
2004 Wisconsin Quarter: Extra leaf error makes it valuable.
2009 D.C. Quarter: Sought after for its doubled die variety.
1976 Bicentennial Quarter: High-grade examples are worth more.
1999-2008 Proof State Quarters: Valuable when graded high.
2019-W West Point Quarters: Limited mintage increases demand.
2015 Homestead Quarter: "Snow on roof" error adds value.
Collecting Tip: Focus on errors, rarity, and condition.
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