Show Cards - Vienna
For stamp exhibitions the United Nations Postal Administration attends, a "Special Card" is issued in most cases, in New York show cards are issued only at exhibitions that UNPA has a regular stamp issuance, however in Europe show cards are issued at all exhibitions attended by UNPA.
The cards are commonly known as a "Show Cards". These are available in three different colours from each office, for New York 'Green', Geneva 'Blue' and Vienna 'White'. Each card bears an appropriate design, an exhibition cachet and a stamp cancelled on the date of opening of the exhibition.