A Declaration Pound coin, produced in 1643 during the English civil war, is valued at up to £50,000 ($77,075) ahead of a March 12 sale at Duke's Auctioneers in Dorset, UK.

It was minted in Oxford, where Charles I moved his seat after his forces lost London.

Charles I was executed in 1649

The coin would most likely have been used to compensate royalist soldiers.

Timothy Medhurst, a coin specialist at Duke's, commented: "This coin marked Charles I's attempts to regain his failing power and it represents a pivotal moment in the history of the British Isles.

"It is a coin which is rare to find and it will cause a stir in the coin collecting world. The value of coins from this period are at an all-time high, and it will be highly sought after…

"It was only six years after this coin was struck that Charles I was beheaded and labelled as 'tyrant, traitor, murderer and public enemy' by the 59 judges who found him guilty of high treason."

The fascinating sale will also feature a vial of Winston Churchill's blood. 

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