1963 Vostok 5, Vostok 6 Stamps

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Vostok 5 — piloted by Valery Bykovsky — and Vostok 6 — piloted by Valentina Tereshkova — were, like Vostok 3 and Vostok 4, a joint manned space flight.

Valentina Tereshkova was the first female cosmonaut.