Sierra Leone. (Liberia). 1916. Liberia postal stationery envelope '3 cents' brown upgraded with 'Service' Yvert 45, 1c black and green (pair) tied by Monrovia date stamp 'Aug 16' routed via Freetown '19/8' with 'G Arms R/ Officially Sealed' label black on salmon with hand-struck 'Opened by Censor' hand-stamp. A remarkable item of WW1 intercepted censor mail from Sierra Leone very few know. Ex Dan Mayo.