Ranking should be based solely on ethic/competence and not on anything else (e.g. price, coin selection).
S Tier – Respected numismatist evaluates each coin. Forgeries are rare and handled swiftly when suspected.
Leu
Nomos
Heritage
CNG
Roma Numismatics – removed because ethics
Áureo & Calico
Stacks Bowers
Numismatica Ars Classica
MDC Monaco
Frank S. Robinson
Jean Elsen & ses Fils s.a.
A Tier – Solid evaluation of each coin. Forgeries are uncommon and handled swiftly when suspected.
Savoca
CGB.FR
Gadoury Monaco
Artemide
Cayon
Silicua
Lucernae Numismática
Pars Coins
B Tier – Non-professional level evaluation of coins. Most coins are real, but forgeries are not uncommon.
Numismatic Naumann
NBS Auctions
N & N London
Demos
Art & Coins
Zeus
Solidus
Bucephalus
London Coins
C Tier – Little regard for coin authenticity, though fakes are not knowingly sold.
Bertolami
Biga
Sol Numismatik
Aphrodite
Holyland Auction
D Tier – Fakes regularly appear. This is either intentional or due to gross incompetence.
Katz – https://www.cointalk.com/threads/okay-we-need-to-talk-about-katz.381734/
Timeline – https://threadreaderapp.com/thread/1404444172849881101.html
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Unranked – TODO
Silicua
Alfa Numismatics
Rio De La Plata
London LTD
Artemide Aste
BAC Numismatics
Antivm Numismatica
Antico Mondo
Apex Numismatics
CoinsNB
Monedalia