Tiny watercolour of Sir Walter Scott and his family could be undiscovered Turner
![Tiny watercolour of Sir Walter Scott and his family could be undiscovered Turner](http://www.scotsman.com/webimage/1.4764985.1530815287!/image/image.jpg)
Art historians believe that a postcard-sized painting, bought at auction in London, could be a previously unknown work by the artist JMW Turner.
Art historians believe that a postcard-sized painting, bought at auction in London, could be a previously unknown work by the artist JMW Turner.