The last Leonardo Da Vinci painting still in the hands of a private collector will go under the hammer next month in New York.
Christie's auction house estimates its worth at $100m.
Dating from around 1500, Salvator Mundi, which depicts Jesus Christ as the world's saviour, was long believed to be a copy of an original by the Italian master, until it was eventually certified as authentic.
Fewer than 20 works by Da Vinci have survived to this day - all of them held in museum or institutional collections, with the exception of Salvator Mundi.
As a general rule, very few pre-19th Century artworks remain in private ownership, and it is extremely rare for one of them to be offered at auction.
"For auction specialists, this is pretty much the Holy Grail, no pun intended, but it doesn't really get better than that," said Loic Gouzer, co-chairman of Christie's Americas' post-war and contemporary art department.
A third-party guarantee has been arranged for the painting, which ensures it will sell for around the estimate of $100 million on 15 November, said Francois de Poortere, head of the Christie's old masters department in New York.
The work will travel to Hong Kong, San Francisco and London, before spending three days on display in New York leading up to the sale.
According to Mr Poortere, Salvator Mundi - which measures 45x65cm - was last sold to an unnamed European collector following a historic Da Vinci exhibition at London's National Gallery in 2011-12.
