60's painting don't throw cigarette butts

Beautiful painting in a thick wooden frame with glass with a notice that reads "please do not throw cigarette butts along the stairs". This notice comes, with its original frame of the time, from a headquarters of the French Section of the Workers' International. Period 60s, very good condition of the frame and glass, some marks on the internal paper. Excellent interesting price of industrial furniture. Dimensions 35 × 25 cm.