Professional Numismatists Guild: PNG

www.pngdealers.com
The Professional Numismatists Guild is a nonprofit organization composed of the world’s top rare coin and paper money experts. As numismatic professionals, our primary mission is to make the hobby safe for collectors and investors by maintaining rigid standards of excellence for our member dealers. PNG is the only numismatic organization in the United States that restricts its membership to dealers who possess and demonstrate three essential qualifications: knowledge, integrity and responsibility.