A woman who believes she has inherited an unknown painting by Manet is offering to sell it for a bargain £500,000 - to someone who could make millions from it. Alex James said her father Adolf Dabrowski told his family he was given the 82 x 65cm still life by an aunt in Paris in the 1950s. Instead of putting it on display the Polish-born eccentric wrapped it in sheets and kept it hidden behind a false back in a wardrobe in a bedroom of his Coventry flat. Alex inherited it after his death 10 years ago - and has been trying to prove its authenticity ever since. Specialists have dated the impressionist work of fish and fruit to around 1880 - three years before Manet's death - and the signature is near-identical to that on his later artworks. It is typical of his style and matches many of the smaller scale still lifes he did in his final years.