Marc Chagall (1887-1985) painted many works of art with the title "L'Hiver." The full name of this work is L'Hiver (La Pendule Ailée ) -- Winter, The Winged Clock. Not only does time have wings, but it's in the shape of a woman!
The original oil painting from 1931 sold in 2012 through Sotheby's for just under $195,000 dollars. In Sotheby's catalog, they quoted from author Franz Meyer's "Marc Chagall: Life and Work": A recollection of Russia painted while Marc Chagall lived in France, L'Hiver (La pendule ailée) combines the artist's personal memories with the symbolic object reconfigurations of Surrealism. The clock returned to Chagall's pictures in the 1930s after an initial appearance in a 1914 painting. In its later iterations the clock is accompanied by a number of whimsical accoutrements, including wings, boots, and, in the famous Time Is A River Without Banks from 1930, an enormous winged fish. In the present work, the clock is winged and given the form of a woman.
Now in a private collection, that makes this postcard all the more sweeter. I imagine most private collectors resist aren't interested in selling commerical copyright use. This postcard is vintage size (about 4 x 6 inches) and is unused. Of interest to note is that the editor Fernand Hazan, who set up his business in 1946 in Paris to become a respected art print house, was the son of a Jewish Egyptian. Chagall was a Russian Jew who fought hard to be accepted in his adopted country of France and boldly called the French out for their bigotry when they didn't want him to get the job of painting the ceiling of the Opera House. When his work was done, the French had a greater appreciation for Chagall!
Ah, but I digress ... . In regard to dating this unused card, I can only tell you that Hazan's company was sold to Hachette in 1992. Which would put the printing of this card between 1946 and '92 -- quite a window of time. It's frustrating to not be able to date something more accurately. I personally think the card is more mid-century from the feel of the paper. I have included a highly contrasted photo to show the light stain at the bottom right and the scratch marks at the top left corner. Despite these signs of wear, I'd say this card is in fine vintage condition.
For color accuracy, please consider the direct scans which show the creamy off white border. The photos taken by natural window light make the postcard look a brighter white.