Isle of Man. (Internment Camp Mail). 1943. Stamp-less envelope written from "O" Camp House 50, I.O.M. c/o Chief Postal Censor, Liverpool' addressed to Lytham St. Annes cancelled by oval 'O. Camp Post Office/ Onchan, I.O.M.' in violet dated '5th Feb 1943' with circular 'Official Paid' date stamp in red 'Feb 10' with 'P.C. 90/ Opened By Examiner/ 51 - 851 - W.H.H. Ltd.' censor tape applied in Liverpool.