29 September 2011 Updated at 09:55 ET
Da Vinci fake is 'real thing', says Oxford expert
The work was sold at Christie's New York for $21,850 in 1998
Related Stories
Finger points to new da Vinci art
An Oxford University professor says he has found conclusive proof that a portrait dismissed as a 19th Century forgery is a genuine Leonardo.
link-
http://www.bbc.co.uk/news/entertainment-arts-15105442