Blank Planchets: Blank planchets are coins that never received a design impression. These are often highly sought after by collectors.
Die Cracks and Cuds: Die cracks and cuds are errors that occur on the coin dies themselves. They can create unique patterns on the struck coins.
Mint Mark Errors: Errors can also occur in the placement or absence of mint marks on coins. These errors can greatly affect a coin's value.
Popular Error Coins: Some error coins, like the 1955 Double Die Lincoln Cent or the 1937-D 3-Legged Buffalo Nickel, have become legendary in the world of coin collecting.
Grading and Valuation: Mint error coins are graded based on their condition, and their value can vary widely depending on the type and rarity of the error.
Collecting Mint Error Coins: Many collectors specialize in mint error coins, and there are dedicated online communities .