February 8, 1880

The artist Franz Marc (February 8,1880 to March 4, 1916) was born in Munich. The location of one of his masterpieces, "The Tower of Blue Horses", has been the subject of speculation. Such as these ideas :

'Marc painted the work just before the First World War. Six years later, it was acquired by Berlin’s Nationalgalerie, as one of the finest works by a radical Blaue Reiter (blue rider) artist. The Blaue Reiter group, led by Marc and the Russian-born artist Wassily Kandinsky, regarded blue as a spiritual colour....

In 1936, Marc’s work was declared “degenerate” by the Nazis, and the following year, "The Tower of Blue Horses" was displayed in the infamous Munich exhibition. This led to protests from war veterans, because Marc had died fighting for Germany in 1916. The painting was then withdrawn from the show, and it was seized by Hermann Göring, Hitler’s deputy, in 1938.

After Germany’s defeat in 1945, the picture went missing. Curators believe that it may have survived because of several reports of sightings. Edwin Redslob, an art historian and the pre-war head of the German government’s culture agency, wrote many years later that he had seen the painting in early 1945 in the Haus am Waldsee, a villa in Berlin occupied by the leader of the Nazi film organisation. In 1961, the journalist Joachim Nawrocki reported having seen the picture in the winter of 1948-49 in a nearby youth centre, formerly the home of the police chief Graf von Helldorf. In 2001, the German Expressionist collector Jan Ahlers said that he had been offered the painting for sale, although he was not shown the work.
....
Katja Blomberg, the organiser of the Berlin half...[an] exhibition on the painting, believes that the canvas was probably seized by Soviet troops after the end of the war and taken to Russia. It may survive there, hidden in a museum store. Michael Hering, the curator of the other part of the show in Munich, agrees, adding that “another possibility is that it is in a cellar or an attic in Germany”.

We can find this painting by Franz Marc: "Two Gray Cats" (1909),  held in a private collection.

I had to look up the difference between calico and tortoiseshell, coat colors. "Calicos have a three-color combination‚white, black, and red-orange. Tortoiseshells lack the white and are often mottled." I could tell how wonderful the painting is, by myself.