(a) inscribed in black fibre-tipped pen on reverse u.r.: JON. CAMPBELL 1992 / "INTERIOR" / enamel/Cottonduck / 2 PANELS, EACH 54" x 72" / 5 (crossed out) 72" x 108" OVERALL. (b) inscribed in black fibre-tipped pen on reverse u.l.: JON. CAMPBELL 1992 / "INTERIOR" / enamel/cottonduck / 2 PANELS EACH 54" x 72" / 72" x 108" OVERALL