Mounted by the Stadel Museum, which owns B's loveliest portrait of Simonetti Vespucci, with more than 40 other works by Botticelli & his workshop, from the Uffizi Gallery in Florence, the Louvre in Paris, the National Gallery London, the Gemäldegalerie in Berlin, and the Old Masters Picture Gallery in Dresden, as well as the Metropolitan Museum in New York and the National Gallery of Art in Washington. Here's a link to an article describing it: HERE