Dated 12 August, 1960, it was discovered inside a book bought at a car boot sale in Liverpool by a coin collector.

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Anyone who has visited a weekend flea market has noticed the old coin and currency collector displays filled with past experiments in national fiat money.

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"I was on a business trip in Europe a couple years ago when I found out that a very rare early-American coin would be going up for auction in Boston the next day, " one collector told me.

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