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| First day cover with a hand-drawn sketch by the stamp designer, Paul Calle. |
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| Maximum card with "Space Twin" stamps and signed by Edward White, the first American to conduct a spacewalk during the Gemini 4 mission on 3 June 1965. - Ira & Larry Goldberg Coins & Collectibles |
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| First day cover signed by the stamp designer, Paul Calle. |
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| Stamp block signed by the stamp designer, Paul Calle. |
