The sale, which was held online by the auction house on Thursday, collected more than $1.8 million, breaking past pre-sale expectations, according to AFP. The online auction was named "On the Shoulders of Giants," a reference to a phrase coined by mathematician Isaac Newton.
Hawking's red and maroon leathered, motorized wheelchair, which the Oxford native used from the late 1980s to the mid 1990s, sold for nearly $400,000. The chair was initially expected to sell for roughly between $13,000 and $20,000.
All proceeds from the wheelchair will go to the Stephen Hawking Foundation and the Motor Neurone Disease Association.
Other items included Hawking's bomber jacket, time traveler's invitation to a party, the original production script from his appearance on "The Simpsons" and a collection of his awards and medals that sold for more than $380,000.
However, the most expensive item that sold earlier this week was a copy of Hawking's PhD thesis, titled, "Properties of expanding universes." The work is signed twice by the physicist and includes the notation, "this dissertation is my original work."
The 1965 thesis, which is one of five known copies, sold for nearly $800,000.
"The results of this remarkable sale, with more than 400 registered bidders from 30 different countries, demonstrate the enormous admiration and affection with which Stephen Hawking was viewed around the world," Thomas Venning, the head of books and manuscripts for Christie's, and James Hyslop, the head of science and natural history, told the New York Times in a joint statement.
According to the Guardian, Hawking's children are planning on donating the remainder of their father's estate to the nation "in lieu of inheritance tax." Christie's is reportedly handling the negotiations for the family.