Dating a chess set
"Lenin at the time was moving around Europe in exile and writing "Materialism and Empirio-criticism".
"His movements are hazy and it is known that he did play chess and later he certainly wore wigs as a disguise.
When the etching was made, Hitler was 20 and Lenin was twice his age and the house was where politicos went to discuss things.
The etching is thought to be one of five and shows Hitler - playing with the white pieces - sitting by a window, with Lenin opposite him in half shadow.
"It makes sense retrospectively and the history of art is full of retrospective meetings between people." The items are to be sold at Mullock's auction house in Ludlow, Shropshire, on October 1.
The Big Short, the film adaptation of Michael Lewis' book of the same name about the causes of the financial crisis, opens in UK cinemas this weekend.
"He compiled a 300 page document and spent a great deal of money engaging experts to examine the etching.
"It may even have been an Austrian socialist with whom he associated in the Second International.
It is titled "A Chess Game: Lenin with Hitler - Vienna 1909".
It raises tantalising questions about what the two men who helped shape the world in the 20th century might have spoken of.
She said: "In 1909 Lenin was in France and there is no evidence that he was in Vienna.
"In October he went to Liege in Belgium and in November he went to Brussels.