4This guide is comprehensive and unsurpassed in presenting the most error coins containing doubled die errors, planchet errors, mint striking errors, off-center errors, and variations. All coin errors listed have been certified by the most well-known encapsulation services and sold by major auction houses. Included are modern day coin error listings with photographs and values at auction. Do you have one of the modern-day valuable coin errors that may still be located in circulation worth thousands of dollars?