Hong Kong. (Prisoner of War Mail). 1919. Stamp-less envelope endorsed 'Prisoner of War Service' addressed to 'Comite Internationale de la Croix Rouge, Geneve', Switzerland' cancelled by Hong Kong date stamp '4th April 19 on reverse, with framed 'PBC' on face and 'G.R./ Opened by Censor' label in black on blue on reverse. Scarce mail from "Hung Hom" Internment Camp home to 200 Germans during WW1.