At £15, this 200-year-old set of Encyclopaedia Britannica seemed a snip.
And more than 30 years later it has become clear just how much of a bargain it was - as it has emerged that it's really worth £9,000.
The 18 volumes were printed in 1797 and are thought to be the oldest privately owned set.
But owner Charlotte Hampson has no plans to sell them, because they are still in regular use by her family.
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Mrs Hampson's father bought them from a friend in the 1970s, but she believes they originally came from a stately home in Suffolk. She said a worker on the estate was given them when they were no longer needed, and they have since been passed on several times.
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The founders of Encyclopaedia Britannica - Colin Macfarquhar, Andrew Bell and William Smellie - were reportedly the first writers in the English language to systemise knowledge and enlighten readers about the latest discoveries in the arts, science and literature. Copies of the first two editions are found only in libraries and museums.