1923, special delivery cover from CREFELD 2.1.23 with 25 Mk letter postage, the special delivery fee not franked with notation "the express carrier change counts consignee", knowingly, that if a number of special delivery documents on that day delivered become, the postage due only single rated becomes, large postage rates rarity, see postage rates handbook, accordingly with 30 Mk postage due, all unusually postal history document from known correspondence, particularly since still "from the postbox" and in Berlin with pneumatic post to the goal, from a large Crefeld homeland history collection