Lot 40222 – 1852 ’10.CENTES:’ PROOF in black on yellow in shee

1852 ’10.CENTES:’ PROOF in black on yellow in sheetlet of 12 with white back, very rare, only a few believed to be known still, illustrated in Vaccaris publication ‘1852-2002 150 years of Modena stamps’ p.49, signed G.Bolaffi, A.Bolaffi, A.Diena & Paolo Vaccari, cert. P. Cardillo, Sassone spec. € 11’000