Cambridge Professor Stephen Hawking has provided a posthumous windfall for two charities.
The wheelchair raised $387,480 (£296,750), nearly 20 times more than pre-auction estimates of up to $19,500 (£15,000). It had been expected to fetch 10,000 pounds to 15,000 pounds. In fact it went for close to £300,000.
When the physicist died in March this year he'd lived with the condition for over fifty years.
A copy of A Brief History of Time by author British theoretical physicist Stephen Hawking, is seen posed ahead of an auction of items from Hawking's personal estate at Christie's in London, Britain October 30, 2018. Hawking's dissertation was the single most expensive item. All of those were sold, and the total, about US$1.8 million, was seven times more than had been predicted.
Hawking's 1965 thesis on the origins of the universe sold for £584,750, more than three times its pre-sale estimate, in the auction that ended Thursday.
A script from one of his appearances on the television series "The Simpsons" was one of the 22 lots under the hammer, selling for £6,250.
Those items included a black bomber jacket, the script from an episode of The Simpsons on which he appeared and a 1988 copy of his best-selling book, A Brief History of Time, marked with his thumbprint as a signature.
Altogether, the items auctioned, which also included possessions of Isaac Newton, Charles Darwin and Albert Einstein, were sold for more than US$2.3 million.
The physicist's daughter, Lucy, said Christie's had been helping the family & "manage our beloved father's unique and precious collection of personal and professional belongings".
"We are also giving admirers of his work the chance to acquire a memento of our father s extraordinary life in the shape of a small selection of evocative and fascinating items".