cover 1864 (15 Jul.) entire from Port Elizabeth addressed to Middelburg, bearing 4d. slate-blue pair, large margins on two sides, just clear or just rouched on other sides, tied by "PORT ELIZABETH/JY 15/64/CAPE COLONY" c.d.s.; entire, with minor creasing well clear of the stamp, endorsed on the side flap, "Blaine & Co. 15 July 1864"; rare