A black chalk drawing by Michelangelo is expected to fetch more than £2m at auction next year.
Study of a Male Torso, which dates from the 1550s, is one of only a few of Michelangelo's drawings to remain in private ownership.
In 1976 it sold for £178,200, setting a new world auction record for an Old Master Drawing.
Christie's will auction the drawing in its Old Master and 19th Century Drawings sale on 24 January.
Michelangelo burned many of the tens of thousands of drawings he produced over his lifetime.
Around 600 survived, and most are held in public collections across Europe.
Study of a Male Torso was part of a collection belonging to John Malcolm of Poltalloch who died in 1893.
Much of the collection was bought by the British Museum after his death, but the drawing remained in the family until it was bought by the current private owner in 1976.
Christie's International honorary chairman Noel Annesley said: "The searching and sensitive chalk strokes of this powerful drawing epitomise Michelangelo's lifelong preoccupation with the expressive possibilities of the male nude."