A Goya oil painting will headline Christie's Old Masters evening sale on December 8.
It's titled A Woman and Two Boys by a Fountain and was produced as a sketch for a series of tapestries commissioned for the king of Spain's dining room in the late 1700s.
The theme was the four seasons, with this canvas representing part of the design for winter.
It shows a family bundled up against the cold, collecting water from a well, and carries an estimate of £4m-6m ($5m-7.6m).
The piece has the potential to trouble the longstanding record for a work by Goya (1746-1828), set at £4.5m ($7.1m) for Bullfight, Suerte de varas (1824) at Sotheby's in 1992.
Despite being a hugely important (and very well-known) painter, only a handful of significant canvases have ever come to auction.
This one hasn't been offered since 1960.
Other highlights include a rare view of the Fortress of Konigstein in Warsaw by Bernardo Bellotto (1712-1780).
It's one of five paintings of the castle he produced for King Augustus III of Poland in the 1750s and is expected to achieve around £2m-3m ($2.5m-3.7m).
Bellotto was trained by his uncle, the great Venetian view painter Canaletto - whose canvases sell for tens of millions.
The value of Belloto's work has grown in value as a result, as collectors seek a more affordable investment.
His record is $11m, set for a view of the Grand Canal in Venice in 2007.