Valentina Tereshkova, first female Cosmonaut, Russia
This card definitely is a favourite ! It arrived here for the Postcrossing April 50 RR sent by Svetlana (Svettok).
It shows the first female Russian cosmonaut Valentina Tereshkova, with matching stamps. She piloted Vostok 6, which was launched into space on June 16, 1963 and flew 48 orbits in almost 3 days.