Münzenhandlung Erwin Dietrich AG is one of the oldest numismatic houses in Switzerland, dealing mainly with the buying and selling of old gold, old silver, coins and numismatics (collection of coins, banknotes, medals and old stocks).

Sotheby’s has been uniting collectors with world-class works of art since 1744. Sotheby’s presents auctions in ten different salesrooms, including New York, London, Hong Kong and Paris.