Double Die Errors: Look for quarters with doubled inscriptions or designs. These occur when a coin is struck twice with slight misalignment, creating doubled details, such as the state name or the date.
Misplaced Mint Marks: Check for quarters with mint marks in unusual positions. For example, the mint mark might be placed in the wrong spot or missing altogether, which can significantly increase the coin's value.
Examine the Edge Lettering: Some state quarters have errors in the edge lettering. Look for inconsistencies or incomplete inscriptions, which can be rare and valuable to collectors.
Die Cracks and Breaks: Examine quarters for cracks or breaks in the die that caused errors in the coin’s design. These can result in interesting and unique features, making the coins highly collectible.
Clipped Planchets: Look for quarters with sections missing from the edge of the coin. Clipped planchets happen when the metal planchet is improperly cut, leading to partial or irregular edges.
Wrong Planchet Errors: Check for quarters struck on incorrect planchets, such as those intended for different denominations.
Unusual Coloration or Surface Issues: Be on the lookout for quarters with unusual coloration or surface anomalies. While less common, these can include unique toning or surface textures that might indicate errors during minting.