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Painting 'a £20m Rembrandt', says expert

18 March 2013 Last updated at 21:12 GMT

A "grubby and dirty" painting on display in the former home of Sir Francis Drake may be a self-portrait by the Dutch Master Rembrandt valued at close to £20m.

For decades the work showing Rembrandt aged 29 was thought to have been painted by one of the artist's pupils.

But leading expert Ernst van de Wetering has re-attributed it as a work by the 17th Century painter himself.