Postcard-sized painting was bought as part of a job lot at auction for $ 30 ( £ 250,000 ) Art experts say it is a work by British artist Rob , worth $ 46 ( £ 250,000 ) A postcard-sized painting bought as part of a job lot at an auction for $ 46 ( £30 ) and left hidden away in a drawer for a decade has been identified as work by John Constable worth more than $ 390,000 ( £250,000 ) . Painting is thought never to have been on public display before .
Postcard-sized painting was bought as part of a job lot at auction for $ 30 ( £ 250,000 ) Art experts say it is a work by British artist Rob , worth $ 46 ( £ 250,000 ) Painting is thought never to have been on public display before .