South Africa last month issued banknotes bearing the picture of Mandela.

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In November, South Africa issued banknotes bearing Mandela's picture.

CNN: Nelson Mandela hospitalized for routine checkup

Each Fed bank issued its own banknotes, much the way commercial banks did in the previous century.

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Police have issued a warning to shopkeepers after a spate of incidents where counterfeit banknotes were used in East Lothian.

BBC: Counterfeit notes warning for East Lothian shopkeepers