In February 2006, an oil painting of his controversial and iconic series "Le Bœuf Écorché" (1924) sold for a record £7.8 million ($13.8 million) to an anonymous buyer at a Christie's auction held in London—after it was estimated to fetch £4.8 million. In February 2007, a 1921 portrait of an unidentified man with a red scarf "(L'Homme au Foulard Rouge)" sold for $17.2 million—a new record—at Sotheby's London auction house. In May 2015, "Le Bœuf", circa 1923, oil on canvas, achieved a record price for the artist of $28,165,000 at the Christie's curated auction "Looking forward to the past".