The piece from the Swiss company's 1518 series sold on Saturday for 11,002,000 Swiss francs following a 13-minute bidding war, according to a statement from Phillips, a leading watch auction firm based in London.
When Patek Philippe introduced the 1518 series in 1941, they were the first-ever perpetual calendar chronographs, meaning they were the first timepieces that had both a stop-watch function as well as a calendar designed to keep track of dates for centuries, with leap years factored in.
Neither the buyer, nor the seller were identified.
A total of 177 watches were sold over weekend in the Swiss city, fetching USD 27.5 million collectively.
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