- The auction house Christie's sold one of the five existing copies of the doctoral thesis of Stephen Hawking, reaching a figure of 760 thousand dollars, nearly four times its estimated value (between 130 and 195 thousand Dollars).
It was expected to fetch £150,000 but interest from across the world saw it reach nearly four times that amount.
A collection of Hawking's medals and awards fetched almost £300,000 ($392,000) more-again well above the expected price.
"Stephen Hawking was a huge personality worldwide", Thomas Venning, head of the Books and Manuscripts department at auction house Christie's London, told Reuters prior to the auction.
In 1963, Hawking was diagnosed with amyotrophic lateral sclerosis, a type of motor neuron disease that causes nerve cells controlling muscles to waste away.
Hawking lived most of his life with motor neurone disease, before dying at the age of 76 in March.
A total of 22 items were sold during the online auction.
Personal effects of Stephen Hawking, including a signed copy of his 1965 PhD thesis, have raised more than £1.8m at auction.
The second most expensive item in the collection is the beloved physicist's former wheelchair, which raised $390,000.
Other Hawking items up for auction included signed books, manuscripts, a bomber jacket, and a copy of the Simpson's script in which Hawking made his final cartoon appearance.
The proceeds will be donated to two charities - the Foundation of Stephen Hawking and the Association for the fight against motor neuron disease (Motor Neurone Disease Association).
Hawking's daughter, Lucy, said the sale gave "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".