Detail from Fra Bartolommeo's Madonna and Child
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Christie's to auction Old Masters

A number of rare European Renaissance paintings are to be auctioned in New York as part of Christie's Old Masters Week.

Among the works set to go under the hammer are pieces by Botticelli, Fra Bartolommeo and Bronzino.

Organisers estimated that the auction could bring in more than $75m (£48m).

Tim Allman reports.

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