A postcard-sized landscape painting bought as part of a box of trinkets costing $50 at auction has been valued at almost $400,000.
The 19th-century artwork was picked up 10 years ago by retired consultant ophthalmic surgeon Robin Darvell after he spotted a faint signature on the frame.
It depicts a landscape in summer with trees in the foreground and rolling hills in the background, set against a blue sky with a few white, fluffy clouds.
The painting had been kept in a drawer but was recently discovered hidden with some paperwork.
John Constable's "The Lock" sold for $35 million last year.
Darvell's son Robert, 45, approached Curtis Dowling, the host of CNBC’s "Treasure Detectives", for an appraisal. Dowling confirmed it was an original by British painter John Constable.