Peter Roehr, Untitled (OB-66(7)) 1966 Estate stamp and the estate inventory number on the reverse: Peter Roehr Nr. OB-66(7). Inscribed in black felt-tip pen on the cardboard backing: ROEHR o.T. (OB-66). As well as labels of the galleries Mehdi Chouakri, Berlin, and Ales Ortuzar, New York 25,5 × 25,5 cm (40 × 40 cm) 36 red adhesive labels on cardboard Galerie Mehdi Chouakri, Berlin / OSMOS Address, New York / formerly Collection of Irving Stenn