Drawings by the Suffolk artist John Constable which were discovered at a house in Michigan will be sold at auction on 3rd July.
The works were collected by the late Jasper Moore.
The drawings, which haven't been seen on the market for 50 years, will be sold by the Bonhams auction house.
Two views of the grounds of Hedingham Castle in Essex appear to be unrecorded.
Mr Moore began collecting works of art during World War II while stationed in California and was still collecting up until his recent death aged 90.
A special exhibtion of paintings by Suffolk artist John Constable has opened showcasing a number of his works all under one roof.
The exhibition is being held at Christchurch Mansion in Ipswich.
He was the artist who turned the Suffolk landscape around Flatford into a feature of the global artistic landscape.
And for the first time all the John Constable paintings owned by the Ipswich and Colchester Museum have gone on display under one roof at the Christchurch Museum in Ipswich.
A work by the English painter John Constable of a scene in Suffolk has sold for £22,441,250 - a world record price at auction for the artist.
The Lock is the fifth in a celebrated series of six large-scale paintings of the Stour Valley that Constable exhibited in the 1820s.
The painting, remarkable for its excellent state of preservation sold at Christie's in London.
The Lock was bought at the 1824 Royal Academy exhibition by James Morrison, who was the son of an innkeeper and who rose to become one of the wealthiest British merchants of the 19th Century.
The Lock remained in the possession of his descendants until 1990. The Constable's buyer remained anonymous.