A John Constable watercolour, whose owner didn't believe that it was genuine, has been consigned to Duke's Auctioneers' September 26 auction in Dorchester, UK.
The watercolour is expected to make more than £5,000 ($7,907), an exceptionally affordable price for Constable's work, which is some of the most sought after from any British artist.
The painting originates from a series of 140 works completed while Constable toured the Medway and Thames rivers on the ship East Indiaman Thomas Coutts.
The collection of folios in which it was discovered was inherited by the current owner, who was a relative of respected collector Phillip Coates. However, it has not appeared at auction until this point as the owner did not believe that it was the real thing.
Another Constable work, bought for £30, has recently been authenticated and is now expected to sell for around £250,000 ($390,000).