Art dealer Vincent ten Vergert, in the Dutch town of Enschede near the German border, was recently offered a painting by a German who had wrapped it in a plastic rubbish bag for transport.

Mr Ten Vergert identified it as a canvas by the 16th century painter Peter Paul Rubens. It is estimated to be worth around 70 million euros.

The painting was one of ten valuable works removed from Sanssouci Castle in Berlin at the end of the World War II to prevent them falling into the hands of the Russians.

The Dutch art dealer was paid a finder's fee for his discovery and the paintings are now back in the castle.

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