London, October 24 2017. A gallery assistant straightens Leonardo da Vinci's Salvator Mundi ('Saviour of the World'), estimated at $100 million at Christie's in London, which will be sold in the Post-War and Contemporary Art Evening Auction taking place on 15 November at Christie's New York. The painting is one of fewer than 20 known paintings by Leonardo, and the only one in private hands. © Paul Davey
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