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In 1974, an American art student in Florence, Italy, stumbled upon a Lost Leonardo da Vinci sculpture in the Museo Archeologico. The unattributed bronze horse (inv. #446) was being used as a mere prop to support an "ancient Etruscan" riding boy. The art student knew the small bronze horse was by Leonardo because Leonardo made a famous drawing of it, now in the Windsor Royal Library (#358.) There are numerous visual links between the sculpture and the drawing. The most compelling evidence is a small, unique saddle fold that is clearly visible on the sculpture and the drawing. If Leonardo drew the small bronze horse, it is highly likely that he sculpted it. The Windsor Library drawing is widely regarded as a "presentation drawing" reflecting Leonardo's original concept for the Sforza equestrian memorial. It is unlikely that Leonardo would draw a horse he didn't make for such an important commission.

Given the strong visual link to a known Leonardo drawing, the art student naively assumed it would be relatively easy to attribute the small bronze horse to Leonardo da Vinci. But this attribution hypothesis has failed to gain any support from the professional art historians who control museums, universities, academic publishing and the attribution process. As a result, this 40-year quest has been entirely self-funded. The former art student, Mark Fondersmith, (now an art director and sculptor) is still trying to scientifically prove this attribution hypothesis and restore a Lost Leonardo to the people of Florence, Italy, and the world. Now in 2017, presents a new hypothesis that Leonardo's original date of 1473 may have been overpainted to read 1425 by a Ufizzi curator sometime in the 17th century.