Swabia 1912, transfer trip Frankfurt - Oos 31.5, droped Karlsruhe R++ppur, extreme scarce, contemporary used brass sheet metal card \"ZEPPELIN airship in the full Flights\" with 5 Pfg Germania and date stamp Karlsruhe R++ppur 31.5 with alongside very clear blue violet on board confirmation mark 31.5, short \"Greeting from Zeppelin . \" and signature of the passenger, these metal installation cards are in contemporary use only in very few copies known, excellent condition, signature Buehler