Postal stationery 5 penny imperial yacht, types of apartments I, used \"BUEA\", to Charlottenburg, with arrival postmarks \"CHARLOTTENBURG 2\" and \"CHARLOTTENBURG 4\", three line stamp \"book of reference understood. Proclamation unsuccessful. P. A. 2 Charlottenburg. \" in violet, similar stamp in black from P. A. 4 Charlottenburg, without Post office number with handwritten notation, return to Cameroon and arrival postmark \"BUEA\", back side with hectographed representation, through it character one privat postal stationery, in perfect condition and in this kind very rare