3The 2020 US Error Coin Guide is the only guide that contains all types of errors. No other book will present as many error classifications with hundreds of listings. The book contains: Doubled dies, Mint striking errors, and Planchet error definitions * Doubled dies * Filled letters/numbers * Lincoln Cent Off Center * Struck on dime planchets * Struck on foreign planchets * Wrong metal * Cracks, defective, flaws, and lamination errors * Clips, elliptical, fragment, ragged, tapered, thin, and thick planchets.