United Nations Postal Administration UNPA will issue three stamps on 12th April 2011 in the denominations of US$ 0.44, CHF 0.50 and € 0.35 in a mini-sheet format of sixteen stamps to commemorate the 50th Anniversary of Human Space Flight. UNPA is also issuing one souvenir sheet with six different denominations, two from each office. The denominations are US$ 0.44, US$ 0.98, CHF 0.85, CHF 1.00, € 0.55 and € 0.65. This is the first time ever that UNPA has issued a souvenir sheet in this format.
On 12 April 1961, Yuri Gagarin of the Union of Soviet Socialist Republics became the first human to travel into outer space. His space flight heralded a new era of human endeavour in what has become known as the “final frontier”. Since that historic flight, humans have set foot upon the Moon, have learned to work in the harsh vacuum of outer space, and, for the last decade, have maintained a permanent human presence outside the Earth.