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Tatty sketch glued to cardboard turns out to be £26,000 Turner.
An original sketch by Joseph Turner which was ripped out of the great English Romantic painter's sketch book and glued down on a piece of card has sold for £26,500.
'The Castle at Tancarville, Normandy' dates from 1832 and shows a ruined castle overlooking the Seine with a group of people in the foreground.
It sparked fervent bidding and achieved a hammer price of £22,000, with extra fees taking the overall figure paid to £26,500.
The sketch, which measures 6.5in by 5.5in and is on blue paper, provided the template for the illustrations in his 1834 book Turner's Annual Tour: Wanderings by the Loire and Seine.