Canada. (Prisoner of War Mail). 1942. Stamp-less envelope headed 'On His Majesty's Service' with 'Prisoners of War Information Bureau/ Department of the Secretary of State/ of Canada' addressed to 'Capt. F.W. Staff, British Intel. Officer, c/o Comdt. Internment Camp, Farnham, Que., cancelled by Ottawa 'V' date stamp 'June 11 1942' with oval 'Prisoner of War/ Information Bureau - Canada/ France de Post/ Post Free/ Gebuhrenfrie' on face with Farnham receiver on reverse. Very fine.