Vintage Divided Postcard Post Card
CATASTROPHE DE LA COURNEUVE. 
Features a scene of the factory explosion that occured there.  From my research, this occured March 15, 1918.  Post card is stamped at the bottom 18 MARS 1918.  So this picture was from a few days after the fact.  Lots of people out for a look.     
USED but not post marked or stamped.  It has writing on the back.  Addressed to Dear Sis.  Date at top appears to be 1918, but it's a bit hard to read. 
Condition Very Good.  Has a smattering of age spots and typical minor corner wear- a line across the bottom white area on the front and a small rust stain on the top left corner area- see photo.