Twelve paintings hidden in a private collection for roughly 50 years are heading to a New York auction valued near $450 million, including a $180 million Van Gogh and a $120 million Cézanne

A collection of twelve impressionist and post-impressionist artworks valued at almost half a billion dollars is going up for auction on November 18, 2026, after sitting unseen for decades in a fabled private collection in South America. The paintings come from a collection amassed by the late Argentine art collector Nelly Arrieta de Blaquier and her sugar magnate husband, Carlos Pedro Blaquier, and are being sold by their children.They include van Gogh’s landscape “Châtaigniers en fleurs” (Chestnut Trees in Flower) estimated at $180 million, and Cézanne’s portrait “Arlequin,” which carries an estimate of $120 million. Neither has been seen in public for half a century. Sotheby’s auction house said on Wednesday that works by Vincent van Gogh and Paul Cézanne are expected to smash records for the artists in the sale to be held in New York.Helena Newman, Sotheby’s head of impressionist and modern art, said the collection was like a “mini-Musée d’Orsay,” the Paris museum that holds one of the world’s greatest collections of Impressionist and post-Impressionist artworks. “In my 30-plus years at Sotheby’s, I’ve never had the privilege of handling a collection of quite this content and calibre,” she said.Newman said van Gogh’s painting of flowering chestnut trees captures the “explosion of energy and vitality” the artist felt after his release from a psychiatric asylum in May 1890. Just two months later, he took his life. On the other hand, the Cézanne portrait is one of four paintings of the artist’s son dressed as the Harlequin figure from clowning. The other three reside in major museums. Also in the collection are Parisian cityscapes by Claude Monet and Camille Pissarro, a horse-racing image by Edgar Degas and a boating scene by Pierre-Auguste Renoir, all valued in the tens of millions of dollars.According to art expert Philip Hook, a former Sotheby’s auctioneer, the collection is “really the stuff of legend,” because the collectors did not loan out the works for exhibitions. “No one really knew what was in it. So now, for this to be revealed, is tremendously exciting,” Hook said. “They came out with a collection that, rather cleverly, is focused on getting one representative work by each of the major names (of Impressionist and post-Impressionist art), and that is incredibly difficult to do,” he added. “They succeeded with huge, huge style and success.”Per Newman, the sale is likely to attract global attention, with potential buyers ranging from American tech billionaires to well-endowed Middle Eastern institutions and rich collectors from North America, Europe, the Middle East and Asia.“In times where there’s a lot of global macro geopolitical uncertainty, it’s almost like there’s a return to really established, tried and tested” works that are “unquestionably great,” Newman said. “(This) museum-quality Impressionist collection … is pretty rare.”