This Rembrandt self-portrait Rembrandt Laughing (ca 1628) which was bought last year for £2.2m at the Moore Allen & Innocent auction house has been validated by Ernst van de Wetering, head of the Rembrandt Research Project, and is now estimated to be worth at least £15m. The auction house originally estimated it to be worth a mere £1,500. Whoops! Congratulations to the anonymous buyer. It just goes to show what bargains are to be had when somebody knows his art.