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Canada’s 1954 banknote series featured a young Queen Elizabeth II—but some people noticed what appeared to be a devil’s face hidden in the curls behind her ear. Although completely u … read more

In 1991, the Bureau of Engraving and Printing installed an experimental press that printed both sides of $1 bills from a continuous roll of paper in a single pass. Known as “web notes,” th … read more

In January 1988, Australia issued a commemorative $10 note that became the world’s first successful polymer banknote. Developed by the Reserve Bank of Australia and Australia’s CSIRO scien … read more

In 1943, the U.S. Mint replaced copper pennies with zinc-coated steel cents because copper was needed for the World War II effort. But a small number of copper-alloy blanks were apparently left inside … read more

Martha Washington remains the only woman whose portrait has appeared on a U.S. currency note. Her portrait was featured prominently on the front of the Series 1886 and 1891 $1 Silver Certificates. She … read more