Deco Flapper 1920s Style Couple Dancing Outsider Art Painting

Artwork of flapper style couple dancing. Lovely deco style outsider art painting. Medium, artist and date unknown. Looks to be acrylic but not sure.

Measures 15 inches by 20 inches.

Damage to corners and edges. Mark by dancers feet. Have not tried to remove. See photos for details. Landscape painting on reverse side.