Tombac
In the field of coins and medals, brass is often called tombac. Tombac typically contains 85% copper and 15% zinc
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Nickel became a scarce commodity in 1942 owing to its importance in the war effort and for the next two years the coin was made of tombac (88 per cent copper and 12 per cent zinc).
An alloy of copper and zinc, in varying proportions, and generally yellow in colour. Tombac is a brass which contains 88% copper and 12% zinc.
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 See also: Silver coin, Numismatic, Various, Unit, Trade
  
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