Did Leonardo Da Vinci Paint Another Mona Lisa?

Some say that a painting with strong resemblance to masterpiece could also be painted by artist.
3:00 | 09/27/12

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Transcript for Did Leonardo Da Vinci Paint Another Mona Lisa?
Now, to the real-life da VINCI CODE. Could the mona lisa have a younger, fresher-looking twin also painted by leonardo da VINCI? The second painting has been hidden in a vault for half a century. And she's now being revealed to the world this morning. Abc's jeffrey kofman has the story. Reporter: Maybe it's her mischievous grin. Hmile is in the lower facial frequencies. Reporter: Now claims that she has a younger twin? Take a look. Today in geneva, the so-called paint willing be unveid after being hidden in a bank vault for almost half a century. Is she the real deal? The owners of a swiss consortium claims that she, too, is a real da VINCI. It's more than a matter of money. People want to believe these things. Isn't it more fun and interesting and exciting to believe that this is by leonardo. Reporter: Leonardo da vinci painted mona lisa in the early 1500s. There's a lot of old copies out there because at the time it was common to duplicate popular paintings. The eyes of the new mona, younger and more smiley, surfaced in 1914, here in london, discovered by an art dealer. It was bought by henry pulitzer who spent his life he owned a da VINCI. But leonardo painted on wood. The other mona is on canvas. Leonardo worked on panel. And the fact this painting is on canvas, to me makes it suspects. Reporter: It's fun to speculate. But science is to advanced now, that a lab can determine a painting's age. An independent analysis c tell us if mona lisa has a twin or just an admiring copy. For "good morning america," jeffr jeffrey kofman, abc news, london. We'll have to wait for that. A fresher, younger copy. Let's get the weather from

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