The star lot in Bonhams auction house’s 19th century sale in London on June 23, is Sir Alfred Munnings’ ‘Sketching at Wiston Bridge’, a portrait of his friend and fellow artist, Maurice Codner.
Estimated to be worth between £150,000-£250,000, it was painted near Nayland on the River Stour.
Munnings’ autobiography tells the story of how he and Codner first found the spot one September.
The two had “walked in the heat from Nayland to Wiston. Plunging, stark naked, in and out of the river to cool ourselves...when round the bend came a large punt with a colourful, summery party of ladies.”
Peter Rees, Bonhams specialist in 19th century paintings, said: “This exuberant painting shows Munnings at his most informal, painting with great freedom and fluidity.”