DUALA Cameroon 20. 8. 12 - (without year date), violet strike of the at the North train used stamp on picture postcard "Fährstelle at the upper Mukombefluss" with 5 Pfg imperial yacht (left above a little round corner) to Berlin, top left on the picture postcard interesting senderãs name "Ernst Bohn Nkongsamba (North train) Cameroon", study group 250.-