Matthew's Galleries, Lake Oswego, Oregon, September 21, 2010. Private Collection. Doyle, New York, Sale of November 5, 2013, Lot 162. Acquired directly from the above sale. Private Collection, New ...

Chip Ettinger, a professor at Eastern Oregon University and his wife Amelia are confident that the drawing of bones (above and lower left) conceals a self-portait of Leonardo da Vinci (lower right).