1860 - 5c green with wide margins, cancelled with mute lozenge, on reverse of cover sent postage due from Piansano to Viterbo, with frontside double-circle “VITERBO 3 OTT 60'. Extremely rare cover of the “Cacciatori del Tevere'. Signed Em.Diena and Mezzadri, cert. A.Diena (Sassone A2 - Euro 160,000)
