Sotheby's will place twelve Impressionist and Post-Impressionist paintings on the block in New York this November, anchored by two canvases expected to challenge global auction records. The Blaquier-Arrieta Collection carries an estimate in the region of 450 million US dollars, making it one of the most valuable single consignments ever offered by the house. The leading lot is Vincent van Gogh's Chestnut Trees in Blossom, painted in May 1890 during the artist's final months in Auvers-sur-Oise, estimated at around 180 million dollars. It is one of only eight Auvers landscapes still in private hands. Paul Cézanne's Arlequin, painted between 1888 and 1890 and showing the artist's seventeen-year-old son in red and black diamond checks, is valued at roughly 120 million dollars and stands as the only composition from Cézanne's four-part Harlequin series held outside a museum. The remainder of the group spans the arc of Impressionism and Post-Impressionism: Claude Monet's 1876 landscape Le Jardin des Tuileries, works by Pierre-Auguste Renoir, Camille Pissarro and Edgar Degas, a late Tahiti still life by Paul Gauguin, Alfred Sisley's La Seine à Port-Marly, a Toulouse-Lautrec portrait and Fauve paintings by André Derain and Maurice de Vlaminck. Assembled by Argentine collectors Carlos Pedro Blaquier and Nelly Arrieta de Blaquier, the paintings spent decades out of public view at the family's estate outside Buenos Aires and many have never appeared at auction. Five of the works went on display at Sotheby's London from September 30, launching an international tour ahead of the November 18 evening sale in New York, which is being presented in partnership with fashion house CELINE.