David Lisot Video Library (2012)
BJ Neff is a devoted researcher of mint mistakes and varieties.
* Why error-ref.com was created and what information it offers
* Numismatic principles of the site including BJ Neff, Mike Diamond, Jeff Ylitalo and Jason Cuvelier
* Categories on the website that include die subtypes and varieties, die errors, planchet and striking errors, mint modifications, and more
* Examples of error coins and their values
Speaker: B.J. Neff.