20 Dollars "Metric Double Eagle / Quintuple Stella" · “Metric Double Eagle / Quintuple Stella”

The Quintuple Stella: America's $20 Bid for a World Currency

In 1879 the United States Mint pressed a $20 gold coin that printed its own recipe on its face — 30 grams gold, 1.5 silver, 3.5 copper, 35 grams in all. It was an experiment in a world currency. Five were struck in gold. Today one of them sold for nearly two million dollars.