The watch, which had been listed with an asking price of only 700,000-900,000 Swiss francs had sold for 7.3 million Swiss francs (USD 7.3 million, 6.7 million euros) after nine minutes of intense bidding by two anonymous telephone bidders, the Phillips auction house said.
That is "the highest price ever paid for a wristwatch at auction," it said in a statement, adding that once the hammer fell the sale had been greeted by a standing ovation in the room at the luxury La Reserve Hotel in Geneva.
In total, the auction raked in USD 11.2 million (10.3 million euros), Phillips said.
All the proceeds of the charity auction goes towards research into Duchenne muscular dystrophy (DMD), a tragic muscle-wasting disease that occurs in roughly one in 3,500 males.
"This fantastic result will allow us to strengthen our efforts in targeting a cure for this severe disease," said Luc Pettavino, head of the Monaco-based AMM association dedicated to finding a cure for the disease and founder of the "Only Watch" auction.