The most expensive coin of all time is this 1933 Saint-Gaudens Double Eagle. The overwhelming majority of the Double Eagles struck that year were melted down following the Great Depression gold recall, and this is the only specimen in private hands, hence its outrageous value.

Formerly owned by coin collector extraordinaire King Farouk of Egypt and luxury shoe designer Stuart Weitzman, the revered coin sold at a Sotheby's auction in 2021 for a phenomenal $18.9 million ($22.3m/£16.7m today).

Now discover the most valuable autographs in history

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The 25 most valuable coins in history