Abbreviation

Coin Grading Services

URL
PCGS Professional Coin Grading Service http://www.pcgs.com
ANACS ANACS http://www.anacs.com/
NGC Numismatic Guaranty Corporation https://www.ngccoin.com
ICG Independent Coin Graders http://www.icgcoin.com
PNG Professional Numismatists Guild http://www.pngdealers.org
     
     
  MUSEUMS  
ANS American Numismatic Society http://www.numismatics.org/
ANA American Numismatic Association https://www.money.org/money-museum
NNC National Numismatic Collection http://americanhistory.si.edu/numismatics/
     
     
     
     
  Industry Watch Dogs  
ICTA Industry Council for Tangible Assets http://www.ictaonline.org/
ACCG Ancient Coin Collectors Guild http://www.accg.us/home.aspx