2002.10.24   United Nations New Definitive Stamp
On 24 October 2002 the United Nations Postal Administration issued a definitive stamp to honour the admission of Switzerland as a new member of the United Nations. The F.s. 3,00 definitive stamp measures 35.96 mm horizontally by 25.73 mm vertically and perforates 14. The stamp was printed in offset lithography by The House of Questa (United Kingdom) in horizontal sheets of 20 stamps. The printing quantity is 580,000 stamps (29,000 sheets). 

In a historic referendum Switzerland voted to join the United Nations on 3 March 2002 and in September 2002,  Switzerland formally joined the United Nations at a session of the UN General Assembly as the one hundred-ninetieth Member of the United Nations.
 

Original information from United Nations Post Administration