The false teeth, specially designed to disguise Churchill's lisp, were sold by the son of the technician who was commissioned to make them.
They had been expected to make a maximum of 5,000 pounds at Thursday's sale by Keys auctioneer.
"The atmosphere was electric," said a Keys' spokesman.
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The buyer, a collector of Churchill memorabilia from Gloucestershire, also owns the microphone with which Churchill announced the end of the war in Europe in 1945.
(Reporting Isabel Coles; Editing by Steve Addison)
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