The North Sea by LS Lowry – estimate £400,000-600,000 at Tennants.

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He wrote: “I started to paint the sea, nothing but the sea. But a sea with no shore and nobody sailing on it…. Look at my seascapes, they don’t really exist you know, they’re just an expression of my own loneliness.”

One of these large-scale seascapes was The North Sea, shown here, which he painted in 1966. It was inspired by his visits to the Seaburn Hotel in Sunderland where he always stayed in the same room, and which looked straight out at the North Sea.

The work, which was last seen on public view at an exhibition the year after it was painted and comes from the collection of a lady in the north-west of England, will be offered at Tennants’ Modern and Contemporary Art Sale in North Yorkshire on October 15.

It is estimated at £400,000-600,000 and is offered alongside two pencil sketches by Lowry: A Pond (£15,000-25,000 estimate) and Man Taken Ill (£12,000-18,000).