Billon (alloy)
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Billon is an alloy of a precious metal with a majority base metal content. It is used chiefly for making coins, medals, and token coins.
Billon dirham of Abbad II al-Mu'tadid, dated 439 AH (1047–1048 AD)
Billon bawbee coin of James V of Scotland (coined between 1538 and 1543)
Billon Two Gani of Delhi Sultan Ala al-din Khilji.
Billon nickel from 1942–45, with "D" mintmark and unusual color.
Shakudō
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Shakudō is a Japanese billon of gold and copper, one of the irogane class of colored metals, which can be treated to develop a black, or sometimes indigo, patina, resembling lacquer. Unpatinated shaku
Unpatinated shakudō
Fuchi. Shakudo, gold, copper alloy (sentoku). The Walters Art Museum.