1940s? Paris-Themed Christmas Card

This neat, undated Christmas card with a Paris WWII theme is $3.95 on eBay. The back side is blank.

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"Vintage flat greeting card, "A Merry Xmas".
Not dated- I presume it is circa WWII.
5" x 7". Stains, creases, edge and corner wear including bends, age tanning. It has an old paper smell.