A painting by French artist Paul Gauguin, previously unknown, is now expected to fetch £1.2 million ($2 million, 1.5 million euros) in a sale in London, later this month.
Auction house Bonhams said that the still-life work, entitled "Bouquet De Roses", was completely unknown before the anonymous seller was contacted.
It is thought that the 1884 oil canvas depicting yellow roses, a traditional symbol of friendship, was originally given to a local politician in Rouen, France.
Pablo Picasso and Henri Matisse both cite Gauguin as an influence, but it was not until after his death in 1903 that he achieved worldwide acclaim.
The painting will go on sale on June 23.