The small picture of a young woman in profile was previously believed to be a German work from the early 19th century and has changed hands in recent years for around £12,000 ($19,000).
But a growing number of leading Leonardo scholars agree the work is almost certainly by the Renaissance figurehead because it appears to have his fingerprint on it. Carbon dating and infrared analysis of Leonardo's techniques back up the theory.
If it is truly found to be the work of Leonardo da Vinci, the piece of art could be worth tens of millions and would be the first major work by Leonardo da Vinci to be identified for 100 years.
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A picture of my cave
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