Inscription
lower left in graphite: O.K.T.P.; lower right in graphite: Mehretu: 2005; lower right verso in graphite by unknown hand: Mehretu: Diffraction OKTP
lower left in graphite: O.K.T.P.; lower right in graphite: Mehretu: 2005; lower right verso in graphite by unknown hand: Mehretu: Diffraction OKTP