(British Post Office) 1846 (NO 21) thin paper, disinfected cover to London, endorsed “Via Marseilles”, bearing fine strike of the rare red crown circle PAID/ AT/ ALEXANDRIA, reddish crayon “1/8(d)” at left, black Alexandria double arc, two diagonal disinfection slits and Maltese Lazaret handstamp, London arrival at top, without any backstamps; fine and clean condition.