USSR 1963 Valentina Tereshkova Vostok 6 Stamps

The first woman in space got her own stamps within days of her flight. This June 1963 design by I. L. Levin sets Valentina Tereshkova's portrait beside the date of the Vostok 6 launch, June 16, 1963, and a line calling her the world's first woman cosmonaut, with the spacecraft's orbit sweeping across a teal sky. It is the Soviet milestone that belongs on the same page as Glenn's Project Mercury stamp, and its two-tone printing makes it one of the most elegant designs in this list.