Identification by leading expert on 17th century Dutch masters will add millions to artwork last publicly exhibited in 1950.
Left high on a library wall for more than half a century, the portrait of a rheumy-eyed old man initially seemed no different from the misattributed old masters hanging beside it.
But after more than half a century of being overlooked, it has been authenticated as a genuine and outstanding work by Rembrandt.
And the identification – by the world's leading expert on the 17th century Dutch master – will make a multimillion pound difference to its price tag.
The painting, known as The Old Rabbi, has rarely been seen by the public since it was last exhibited in 1950. Since then it has hung in the private apartments of Woburn Abbey in Bedfordshire, family home of the dukes of Bedford.
Although there is no suggestion it will now head for the auction rooms, the price difference between a genuine Rembrandt and even the best work by his studio is in the order of millions. In 2009, a world record was set for his work when a half-length portrait of a young man sold for £20m at Christie's.
"We were all so excited at the expert verdict – the Duke was absolutely cock-a-hoop," said Abbey curator Chris Gravett, who had noticed the evident quality of the painting during his nine years working for the duke, and had become increasingly intrigued by it. This was despite competition from a collection that includes 10 paintings by Van Dyck, 12 by Reynolds, three Gainsboroughs, and a room virtually wallpapered with 24 Canalettos bought by the 4th Duke on the Grand Tour in the 18th century.
The detective work by Ernst van de Wetering, a Dutch art historian and chair of the Amsterdam-based Rembrandt Research Project, has also restored the reputation of another suspect painting – a portrait of the artist's wife Saskia owned by the Gemäldegalerie in Berlin.
Van de Wetering, who spent a long day at Woburn poring over the panel, now believes the two pictures are a pair, linked by details of costume, pose and jewellery – particularly the rings on their beautifully contrasted hands. The young woman's smooth flesh is markedly different from the tissue-paper-like crinkles of the old man's skin.
He believes the pictures represent the biblical story of the exiled Ruth who married the kindly but much older Boaz.
Both appear to be painted on mahogany panels from the same packing case which originally held sugar from the West Indies. The Berlin painting is dated 1643, but Van de Wetering believes the slightly later date on the Woburn painting was added after the painting was completed.
Gravett has contacted the Berlin museum, and hopes one day the two paintings can be displayed side by side.
Photo: Rembrandt's Portrait of an Old Man, or The Old Rabbi, was identified by Woburn Abbey curator Chris Gravett. Photograph: Graham Turner
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