Fingerprint points to $19,000 portrait being revalued as £100m work by Leonardo da Vinci
ATG correspondent SIMON HEWITT gains exclusive access to the evidence used to unveil what the world's leading scholars say is the first major Leonardo Da Vinci find for 100 years.
Is this 13 x 9in (33 x 24cm) portrait, in chalk, pen and ink on vellum, mounted on an oak board, a l…