A Constable oil sketch previously believed to be a copy has been auctioned for £91,000.
The painting of Dedham Vale was sold by Sworders’ auctioneers on Wednesday.
John Constable, best known for 1821 masterpiece The Hay Wain, used the sketch as the basis for his “Dedham Vale, Morning” picture.
Sworders’ Sarah Flynn said the inclusion of one of his father’s mills in the picture “makes it a particularly personal image”.
The sale price of £91,000 is inclusive of buyer’s premium, an additional charge made by the auctioneer on top of the amount an item is sold for at auction.
Sworders’ said the sketch was rediscovered by its London office having previously been dismissed as a copy by another auction house.
Pictures specialist Ms Flynn took it to Anne Lyles, a world-renowned authority on Constable.
She declared it “an exciting new discovery”.
Constable (1776-1837), was believed to have painted the 26.5 x 43.5cm (10½ x 17¼in) sketch in 1809-10.
The picture, called “Dedham Vale with Brantham Mill and haystacks”, had previously hung in a private house in London for many years.
It features the distinctive tall tower of Dedham Church and, across the River Stour, a windmill at the village of Brantham.
The windmill is believed to have been owned by his father Golding Constable, who the BBC’s Who Do You Think You Are programme discovered was distantly related to East Enders/Carry On actor Barbara Windsor.
The most famous representation of the panorama is Constable’s “Dedham Vale, Morning”, which he exhibited at the Royal Academy in 1811.
The sketch had been sold to Major AW Allen, an ancestor of the latest sellers, in 1946.
Ms Flynn said: “It is the dream of every auctioneer to discover a picture by one of the greats of western art.
“Dedham Vale is intimately associated with Constable’s life, but the inclusion of one of his father’s mills in this picture makes it a particularly personal image.”