You’ve Got To Know This Or You’re Messing Up Big Time! You need these websites and resources before you search for mint error coins, doubled die coins, die varieties, rpms, repunched mint marks or anything different about your coin, including anomalies.
Help community https://coinauctionshelp.com/forum/viewtopic.php?t=35453
Mint error guide https://coinauctionshelp.com/mint-error-coin-guide-images-values-app/
Mint error video guides https://www.youtube.com/playlist?list=PLku4wL94a2MMXSU6rsjz0Y48GYPWb2ozb
CONECA https://conecaonline.org/
Variety Vista http://www.varietyvista.com/
Wexlers doubled dies https://doubleddie.com/58201.html
Jefferson Nickel doubled dies https://www2.briansvarietycoins.com/listings
Error Reference https://www.error-ref.com/
Ebay error listings https://www.ebay.com/b/US-Coin-Errors/524/bn_2309707
Heritage error listings https://coins.ha.com/c/search/results.zx?si=2&dept=1909&dept_child=4421&archive_state=5327&sold_status=1526&coin_category=2198&mode=archive&page=204%7E1&sb=5&ic4=SortBy-071515
Stacks Bowers error listings https://archive.stacksbowers.com/?q=103713d9-79bd-4190-81c5-7720f32ad5af
Great Collections error listings https://www.greatcollections.com/Auction-Archive/U.S.-Coin-Prices/29/Error-and-Pattern-Coins/117/Error-Coins/6000118/Error-Coins/?af_c_sorthigh=true&af_c_sortdate=false&af_c_pcgs=true&af_c_cacg=true&af_c_ngc=true&af_c_pmg=true&af_c_anacs=true&af_c_legacy=true&af_c_other=true&af_c_plus=true&af_c_nonplus=true&af_c_cac=true&af_c_noncac=true&af_c_ungraded=false&af_c_busi_strike=true&af_c_spec_proof=true&af_s_yearfrom=&af_s_yearto=&af_s_keywords=&af_gd_min=1&af_gd_max=70
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