Lloyd Hefferman, 38, was enjoying a summer drink with his friends at The Botolph Arms pub in Peterborough, Cambs, when bar staff handed him the coin.
The 20p coins, which are the first in 300 years to enter circulation without a date, are still legal tender and have caused a frenzy in the coin collecting world.
A number of the coins have already sold on auction site eBay, with one fetching £7,100 last week.
Mistakenly released by the Royal Mint in Cardiff last year, each piece has a . . .
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