1943. Registered Nigeria postal stationery envelope 3d blue upgraded with SG 50, 1d carmine (strip of three9 tied by 'Muyaka/Cameroons Under British Mandate' double ring '24 My 43' with provisional registered label, addressed to French Cameroons, routed via Buea (British Mandate) and Victoria '26/5' with Nigeria framed 'Censor' hand-stamp in red on face and circular 'Controle Postal/Commission A/ Territoire du Cameroun' censor cachet and M'Balmayo arrival '3rd Juin' on reverse. Superb item and rare stationery. (T) (Tax Method: Margin System) (Image)