(British Occupation) 1915 (31.3) ‘Sofort zu offnen’ (Open Immediately) printed envelope that has been amended in manuscript to “O.H.M.S.” stampless registered envelope to St Jouan des Guerets, France, with blue manuscript lines and R , two strikes of framed ‘T.’ Handstamps, Duala (Kamerun) a cds at top left, Registered Plymouth transit backstamp with registration label applied to front, arrival backstamp; a rare occupation cover.