The United States Notes are probably the most counterfeited notes in the world.
Historical examples
There are several famous examples of counterfeit dollar notes in history. Among them:
2005: Peru 2001 CB-B2 series $100 bill, issued 2001
In 2005, Peruvian Banks started not accepting $100 bills from the series CB-B2 issued 2001. They were so well made that were dubbed the "perfect fakes" by the Peruvian media. The differences between them and genuine bills are very small and difficult to detect[1]. It is said that an actual real printing plate from the U.S. mint was stolen by a Pakistani mafia[2] maybe linked to Al Qaeda was used to produce these bills.
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