An Asian collector bought a platinum chronograph Patek Philippe wristwatch owned by British rock guitarist Eric Clapton for 3.44 million Swiss francs ($3.63 million) at auction on Monday, Christie’s said.

The “ultra-rare” reference 2499/100 by the Swiss luxury watchmaker, one of only two cased in platinum, was acquired by Clapton some 10 years ago, it said.

It fetched a combined hammer price and commission that was in line with Christie’s pre-sale estimate of 2.5-4.0 million francs while also setting a world record price for this reference at auction, it said in a statement on its semi-annual Geneva sale.

“The Eric Clapton watch was bought by an Asian private collector, “ Christie’s spokesman Cristiano de Lorenzo told Reuters, adding that the buyer had been in the room.

Clapton’s Patek Philippe, made in the Swiss city in 1987, has a perpetual calendar with moon phases, as well as windows for day and month and dials for seconds and minutes.

Clapton, the former Cream musician, last year sold more than 70 of his guitars at a charity auction in New York, raising $2.15 million for the Crossroads Centre drug and alcohol rehabilitation centre that he founded in Antigua