1851, Britannica 1d. red-brown, fresh colour tied by numeral "1" to folded lettersheet via London and Calais to Naples with red oval "A FRANCA" and "P-D." and manuscript markings "3'6" in London with 1s8d. to London and 1s.10d. for foreign transit, adhesive and letter with small imperfection, a very attractive and rare cover (Image)