A George III pattern £5 coin is to auction at Spink London on May 14.
It will provide the headline lot of the sale of the Slaney collection of English coins, with a valuation of £100,000-120,000 ($153,634-184,361).
The piece is one of only 25 specimens struck in 1820. It displays an iconic George and the Dragon design by Italian engraver Benerdetto Pistrucci and was the first coin of this value ever produced.
Other lots include a Charles I Oxford £1 minted in 1644.
It's expected to make £60,000-80,000 ($92,180-122,907).
The lot was issued during the English civil war, following the king's flight from London. He set up court in Oxford, where he orchestrated his armies until his defeat in 1646.
We have this Charles I shilling minted in the besieged city of Carlisle in 1645.
Spink comments: "The first part [of the Slaney collection], sold in May 2003, was regarded as one of the best sales for many years, and the second half has been eagerly awaited…
"After residing unseen in the Slaney cabinet for over 60 years, these magnificent coins will finally be offered to a new generation of collectors."
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