artist stamp in red ink on reverse c.: JOSE M. LOPEZ / LUIS MEDINA / 3716 N. CLARK STREET / CHICAGO, ILLINOIS inscribed in pencil on reverse l.r.: 45 (in a circle) inscribed in fibre-tipped pen on reverse l.r.: HALLOWEEN PARADE, JOLIET Ill. 1973 inscribed in pencil on reverse l.c.: 45 (in a circle)