1868 40c yellow, vertical block of six (2x4), small h.r. at top, other four stamps n.h., middle stamp at left showing a natural perforation defect, signed Diena, Chiavarello and Raybaudi, with certificates from last two (Sass.29a, Euro 27,000 for hinged singles) (Cat No. 24a) (Image)

Est.US$1,500