Tucked away in a Swiss vault for 40 years, a painting promoted as an earlier version of Leonardo da Vinci's masterpiece "Mona Lisa" was unveiled in Geneva.

Known as “The Isleworth Mona Lisa” for the London suburb where a previous owner lived, the painting is said to depict Lisa del Giocondo, circa 1505, as a younger woman, twenty years earlier than "Mona Lisa."

An international consortium owns the picture now and a “Mona Lisa Foundation” was formed to verify decades of research over its authenticity. Findings were made available online on Thursday.

Art scholars will debate whether the evidence stacks up in favor of two Mona Lisas.