Isle of Man. (Internment Camp Mail). Circa 1916. Stamp-less envelope headed 'Prisoner of War' addressed to Konstantinople, Pera, Turkey' endorsed on reverse 'Hut 6a, Camp 11, Compound IV, Knockaloe Aliens Camp, Isle of Man' with 'Opened by Censor/ P.W. 120' label, routed via Austria with framed 'Zensuriert/ K.U.K. Zensurstalle Wien' on face in red and circular censor arrival with bilingual 'Pera Arrive' date stamp. Mail from Knockaloe Camp to Turkey must be scarce.