Numismatist noted numismatist who was not an avid collector, and King Farouk I of Egypt was an avid collector who had very little interest in numismatics. Harry Bass by comparison was a noted collector who was also a numismatist. The second group are the coin dealers. Often called professional numismatists, they authenticate or grade coins for commercial purposes. The buying and selling of coin collections by numismatists who are professional dealers advances the study of money, and expert numismatists are consulted by historians, museum curators, and archaeologists. See, for example, the International Association of Professional Numismatists (IAPN) and the British Numismatic
Henry Cohen (numismatist) Henry Cohen (numismatist) Henry Cohen (Amsterdam, 21 April 1806 – Paris, 17 May 1880), was a French numismatist, bibliographer and composer. Cohen moved from Amsterdam to Paris, where he worked as a music teacher and served as curator of the Cabinet des Médailles at the "Bibliothèque nationale de France". He published several works during his lifetime. Cohen's "Guide de l'amateur des livres à vignettes du XVIII Siècle" went through four editions and is considered the standard bibliography of French 18th century illustrated books. He is perhaps best known for his two fundamental works on ancient numismatics: the first, published in