Picasso, Michelangelo masterpieces to go under hammer

Christies' pre-event exhibition showcases 250m worth of art due to go on sale over next four weeks
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Ron Mueck's 'Big Baby' sculpture appears to look round at Jenny Saville's painting 'Interfacing' at the Masterpieces Exhibition at Christie's on June 13, 2011 in London, England (Getty Images)
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Gainsborough's 'Portrait of Miss Read, later Mrs William Villebois' is displayed at the Masterpieces Exhibition at Christie's on June 13, 2011 in London, England. The painting, estimated at £4-6m, features in the exhibition, open to the public from 13th - 15th June 2011, which showcases some of the £250m worth of art for sale over the next four weeks. Artists including Michelangelo, Gainsborough, Goya, Stubbs, Monet, Picasso and Renoir are represented (Getty Images)
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Visitors examine 'A male nude seen from behind' by Michelangelo at the Masterpieces Exhibition at Christie's on June 13, 2011 in London, England. The drawing, is estimated at £3-5m (Getty Images)
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A visitor looks at Pablo Picasso's painting 'Jeune fille endormie' at the Masterpieces Exhibition at Christie's on June 13, 2011 in London, England. The painting is estimated at £9-12m (Getty Images)
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An employee looks at George Stubbs' painting 'Gimcrack on Newmarket Heath, with a Trainer, a Stable-Lad, and a Jockey' at the Masterpieces Exhibition at Christie's on June 13, 2011 in London, England. The painting is estimated at £20m (Getty Images)
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A set of Four Empire Ormolu-MountedChinese Porcelein Vases are displayed next to 'The Dance of Salome' by Gyula Tornai at the Masterpieces Exhibition at Christie's on June 13, 2011 in London, England. The vases and painting, feature in the exhibition, open to the public from 13th - 15th June 2011, which showcases some of the £250m worth of art for sale over the next four weeks. Artists including Michelangelo, Gainsborough, Goya, Stubbs, Monet, Picasso and Renoir are represented. (Getty Images)
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The prayer book by Simon Bening is displayed at the Masterpieces Exhibition at Christie's on June 13, 2011 in London, England. The book, estimated at £1.5-2m (Getty Images)
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A news camera woman films Claude Monet's 'Nympheas' at the Masterpieces Exhibition at Christie's on June 13, 2011 in London, England. The painting is estimated at £17m (Getty Images)