India. (Indian POW Mail). 1943. Stamp-less envelope headed 'Service of Prisoners of War' written from 'W. Dreyling, No 55669, Central Internment Camp, Wing 6, Dehra Dun, British India' addressed to Holland with hand-struck 'Serive of Prisoners of War' and framed 'Crown/Passed / DHN/ 2' hand-stamp of Dehra Dun and 'DHN/ 2' in violet with German censor strip on reverse tied by circular censor in red.
Ex Paul Bulterman's Internment Camp collection and illustrated in his book "Nederlands Indie in Oorlog" page 37.