cover 1877 (28 Jan.) non-concessionary rate envelope to Scotland "Via Brindisi", bearing 1a. (2) + 4a. lightly cancelled by "ADEN CAMP/B-22/I" duplex and tied by two bold strike of the oval "ADJUTANTS OFFICE/VITH/REGIMENT A.I.", with Aden G.P.O. c.d.s. (D14.) and arrival c.d.s. on reverse. A fine and interesting example of the scarce 6a. rate. Photo