'C. Dewilde-Dupont et ses enfants. Jazz-Band du Théatre des Familles'.
Three violins, mandolin-banjo (banjolene), two piccolos (or are they band fifes?), a one-string cello, and a drum-set worked by foot pedals.
The jazz-band tag dates it at the earliest as 1917, but is more likely1919-1922.  A French trade postcard.
From the Reg Hall Collection.