Sperati Forgery 1859 1/3 groschen (as SG 10) proof on glazed white paper (42mm x 55mm), 'REPRODUCTION INTERDITE' (reproduction forbidden) at top, Jean Sperati signature at base in pencil, reverse with 37mm circular motif, '*LES 'JEAN-DE-SPERATI*PHILATIE d'ART*' surrounding sunburst in yellow, very light toning. The issued stamp was printed imperforate in black on green paper.