1864 - 50 Baj. dark ultramarine blue with defective print n.12, used. Three large margins and flush on the left, very well preserved. The rare stamp is accompanied by three certificates and signed several times by the experts of the time. Occasion. Cat. 7,500. (A-) (Cert. Raybaudi, Cert. Fiecchi, Cert.Oliva, Emilio Diena, Alberto Diena, Chiavarello)