The Stephen Hawking 50p coin was released on 12 March. It was created to honour the British scientist and professor who died last year at age 76.
Hawking inspired many, not only because he overcame the adversity of his condition, but because of his astounding mind and his achievements in science.
The Oxford and Cambridge alum had motor neurone disease.
Now the coins made in his honour are being sold for large sums.
Fans of the scientist can spot the coin as it has a distinctive image of a black hole on it.
The coin was designed by Edwina Ellis, who said: "I wanted to fit a big black hole on the tiny coin and wish he was still here chortling at the thought."
Ebay user Mcellenbear flogged a gold version of the coin online. Only 400 of these pieces were made, and the seller claims they sold out immediately.
The eBay user described the coin as a “truly beautiful design and rare collectors coin to own in your collection.
“You will receive one brand new Stephen Hawking gold proof 50p coin with all original packaging direct from Royal Mint. “Once I receive from Royal Mint I'll send out to the winner.
“If there are any delays from Royal Mint on delivery I will keep the winner fully informed throughout the sale.”
How rare are the Stephen Hawking 50p coins?
The gold proof coins, which were sold for £795 by Royal Mint, are very rare, with only 400 being produced.
A silver proof piedfort coin would set collectors back by £95 from Royal Mint, and there are 2,500 of these.
Silver proof
