From £400 to £1.5 million in less than 15 months.
Sold for just £400 at Dreweatts in April last year as a work by a follower of JC Ibbetson, the picture was cleaned, and JMW Turner’s signature was discovered. It was sold last week at Sotheby’s for £1.5 million hammer price, amidst a bidding battle involving several museums.


