Attached is a scan of a cover from A.I.F. Field P.O. 24 dated 22 June, 1942. At the time this post office was attached to 6 Division Postal Unit on Ceylon, attached to A.I.F. Ceylon. Of interest is the only censor marker visible on the envelope is South East Asian Unit Censor Marker number C69. As this censor marker is also used on envelopes from East African Army PO 69 also on Ceylon(scan attached) why would the same unit censor marker be used on both envelopes. Or is it a fact that this censor marker was being used as a base censor stamp  as other unit censor markers are visible on the East African cover :).