One of the earliest known works by 18th-century painter Thomas Gainsborough, that was originally misattributed and bought by a retired company director for £2,600, is to be sold at auction with a pre-sale estimate of £30,000 to £50,000.
British artist Gainsborough (1727-88) is believed to have painted the portrait of a woman, a member of the Seton family, at the age of 16.
