inscribed in fibre-tipped pen l.l.: 2/15 inscribed in fibre-tipped pen l.r.: Matthew Sleeth (underlined) inscribed in fibre-tipped pen on reverse l.l.: 2/15 inscribed in fibre-tipped pen on reverse l.r.: UNTITLED #15 from OPFIKON, 1997 / PRINTED BY MS – JUNE 2004 / Matthew Sleeth (underlined)