Nile Expeditionary Forces 1884 (December 4) Cover mailed from Kingston addressed to the Surgeon Major Neilson of the Canadian Contigent of Voyageurs stationed at Tangour Hospital in Wady Halfa, located on the Nile river near the Egyptian and Sudan border; franked with a single 5¢ olive green (Montreal printing), perf 12 (Sc. #38) and tied by Kingston duplex datestamp