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Recent tests on the Isleworth Mona Lisa support the theory that the painting pre-dates the Louvre’s world-famous portrait by Leonardo da Vinci (1452-1519). Hidden in a Swiss bank vault for 40 years, the Isleworth Mona Lisa was unveiled to the public on September 27, 2012, inciting rampant speculation about the work’s history. The Louvre’s Mona Lisa, which is believed to have been painted between 1503 and 1506, has been considered the only one of its kind for centuries.

The Swiss Federal Institute of Technology and Alfonso Rubino, a specialist in “sacred geometry,” carried out tests on the 15th century Isleworth portrait after its unveiling. Carbon dating determined that the canvas was manufactured between 1410 and 1455, shooting down claims that the Isleworth Mona Lisa was a late 16^th century copy. Rubino’s geometric analysis also supported the da Vinci attribution, explaining that the geometry of the Isleworth portrait matched the geometry used by da Vinci in his other works including the Vitruvian Man (circa 1490).  

The new findings combined with the existing scientific and physical research build a strong case for the Isleworth Mona Lisa. The Zurich-based Mona Lisa Foundation is even on board with the claim, vowing to pursue efforts to prove the portrait’s authenticity.

On Monday, December 10, Zurich, Switzerland’s largest city, admitted to losing track of 5,176 works of art. The realization came after the city performed the first full inventory of its collection that is comprised of 35,000 important pieces in nearly a century. Among the missing objects were approximately 1,400 original works including a painting by Swiss-born architect and pioneer of modern design, Le Corbusier.

Officials expect to locate most of the missing works as the city’s collection is often sent out for exhibitions and is currently spread across more than 500 locations. Zurich’s vast holdings are worth about $130 million in total, but city officials claim the missing works only account for a fraction of amount.

Juan Carlos Emden, the grandson of a wealthy Jewish businessman, is demanding that the Swiss Buehrle collection return a Claude Monet painting that the family was forced to sell as they fled Europe during World War II. The masterpiece was sold in haste for a little less than $32,000. The painting today is valued at around $27 million.

Emden is the Chilean grandson of Max Emden who bought Monet’s Poppy Field Near Vetheuil in the 1920s. Max was forced to flee Nazi Germany in 1933 for Ticino, Switzerland, where he built the Villa Emden to house his art collection, including Poppy Field Near Vetheuil, one of Monet’s most famous paintings. After his death in 1940, Emden’s son, Hans Eric Emden, was forced to sell his father’s art collection to finance his fleeing to South America from Europe.

Juan Carlos Emden is rumored to have been fighting for years to regain ownership of his grandfather’s painting and is planning to travel to Zurich to discuss how to recover the work with his lawyers. Poppy Field Near Vetheuil was stolen during a heist at the Buehrle museum in 2008, but it was found several days later.

Shortly before World War I English art collector, Hugh Blaker, found a portrait now dubbed the Isleworth Mona Lisa in Isleworth, London. For the past 35 years the Zurich-based Mona Lisa Foundation has been working to prove that the painting predates Leonardo da Vinci’s 16^th century masterpiece by 11 to 12 years. The experts involved based this conclusion on a series of regression tests, mathematical comparisons, and historical and archival records.

While at least one da Vinci expert is doubtful, the researchers involved in the Mona Lisa Foundation’s project are confident in their claim. Mathematical tests have proven that both of the sitters are in exactly the same place. Such accuracy was typical of da Vinci. Sporting the same enigmatic smiles, the posture, hands, faces, and expressions bear a striking resemblance.

Dissidents, including Oxford art historian Martin Kemp, think that the Isleworth Mona Lisa lacks the subtle details of the original. While the Isleworth Mona Lisa does look like a younger version of the original, the veil, hair, and the translucent layer of the sitter’s dress are lacking in quality.

The Isleworth Mona Lisa turned up in the home of an English nobleman during the late 19^th century and was shipped to the United States during the First World War. The painting was subject to analysis in Italy and was eventually taken to Switzerland where it remained in a bank vault for 40 years. The Isleworth Mona Lisa was unveiled by the Foundation on Thursday in Geneva and evidence of the painting’s authenticity was presented at the University of California.