Commemoration
The first spacewalk, that of the soviet cosmonaut Alexey Leonov was conmemorated in several eastern bloc stamps (see the stamps section in Alexey Leonov article). As the Soviet Union did not distribute diagrammes nor images of the Voskhod spacecraft at the time, the spaceship depiction in the stamps were purely fictional.
The US Post Office issued the Accomplishments in Space stamp in 1967. Along with astronaut Ed White, the issue depicts the Gemini IV spacecraft in orbit.
Read more about this topic: Extra-vehicular Activity