Recommended reading:
Price guide to mint errors by Alan Herbert (different editions. 2002) The prices are not relevant but errors are very good described)
The error coin encyclopedia by 1991 Arnold Margolis.
Monnaies Fauteés by Jean-Claude Chort, 2009 (in french, has very good illustrations)
Mint errors to die for, 2021 Cronin, Joseph
Useful links:
Minterrornews, Mike Byers magazine on error coins
CONECA american error coin society
Fred Weinberg, coin dealer since long,
Sullivans numismatics, has a huge stock of mint errors
Andreas Fenzl, dealer from Germany
Minterrordatabase.com an italian site made by Sena Coins
Etienne Barbots site on clipped planchets
My Ebay auctions look for: martinerrorcoins I have appr 100 auctions and many not listed here.
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