An effort is under way to construct a comprehensive, illustrated online glossary of every known category of die variety and minting error. It is called the Error-Variety Ready Reference and can be found online at www.error-ref.com.
Error researcher and author Mike Diamond is editor-in-chief of the project. BJ Neff, Jeff Ylitalo and Jason Cuvelier serve as contributing editors. Error dealers Fred Weinberg and Jon Sullivan serve as consulting editors. Neff created and maintains the website.
Each entry in the glossary comes with a definition, explanation and photographs of representative specimens. At least 850 entries are planned.
The glossary is built on scaffolding provided by the “Comprehensive Error-Variety Checklist,” a 22-page classification created by Diamond. The checklist is available on the website and is periodically updated.
Users seeking information on entries that have not yet been completed can contact the editors using the “Contact Us” section to ask that the matter be expedited.
The editors welcome comments and contributions from site visitors.