The United Nations Postal Administration (UNPA) is the postal agency of the United Nations. It issues postage stamps and postal stationery, denominated in United States dollars for the United Nations offices in New York, in Swiss francs for the offices in Geneva and in euros (formerly schillings) for the offices in Vienna. Postage rates charged are identical to those of the host nation. Only United Nations stamps in the appropriate currency may be used at a given United Nations office. In practice, however, most UN agencies use meters, and the stamps are most often used by tourists and collectors.
This is my first Airmail cover from United Nations Post Office in Vienna, Austria. my good friend Florian sent me this cover. These beautiful flora and fauna stamps gifted by Holger Kaufhold, during his visit in my hometown. Thank You Holger and Florian for the big help.