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Eden began his career in numismatics in 1969 and founded the rare coin and medal auctioneers in 2001 with James Morton.

The pair set up their firm in central London to take over the gap left by Eden’s former employer Sotheby’s which closed its coin department that year.

However Morton & Eden, which focuses on rare coins, banknotes, medals, orders and decorations, have continued to work with Sotheby’s on a number of sales.

Eden, who specialises in ancient Greek, Roman and Byzantine, Islamic coins, Renaissance and Baroque medals and plaquettes, will now become a consultant in the firm working part-time.

He said: “It has been a fascinating experience and one in which I will continue to play a part.” Highlights at the firm have included the sale of an extremely rare Umayyad dinar dating back to 723 AD. It was sold at auction in 2011 and bought by a European collector for £3.1m, making it one of the most expensive coins to ever sell at auction.