The 1999 Delaware quarter features a "Close Am" variety where the letters in "AMERICA" on the reverse are close together. This error is highly sought after by collectors and can significantly increase the coin's value.
Some 2004 Wisconsin quarters have an additional leaf on the corn stalk on the reverse, known as the "Extra Leaf" variety. This error is rare and can greatly enhance the coin's value.
The 2005 Minnesota quarter displays an "Extra Tree" error, where an additional tree appears in the design on the reverse. This error is valuable among collectors for its rarity.
The 1999 South Carolina quarter features an "Inverted Flag" error, where the flag on the reverse is misaligned. This error makes the coin unique and more valuable to collectors.
The 2000 New Hampshire quarter has a "Doubled Die" error where the inscriptions on the obverse are doubled. This type of error is rare and increases the coin's value.
The 2002 Ohio quarter features a "Doubled Die" error where the state’s name is doubled on the reverse. This error is highly prized and sought after by collectors.
The 2006 Nevada quarter has a "Misplaced Mintmark" error where the "D" mintmark is misaligned. This error is unusual and can command a premium among coin enthusiasts.