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| A First Day Cover commemorating the release of the twin 5-cent “Saluting United States Space Achievements” stamps, also known as the “Space Twin,” postmarked at Kennedy Space Center with a machine cancel on September 29, 1967, and featuring a hand painted cachet by artist Paul Calle. |
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| A postcard featuring the “Space Twin” stamps and a photograph of Edward White conducting his historic spacewalk during Gemini 4, postmarked at Kennedy Space Center with a hand cancel on September 29, 1967, signed by Edward White. - Ira & Larry Goldberg Coins & Collectibles |
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| A First Day Cover commemorating the release of the “Space Twin” stamps, postmarked at Kennedy Space Center with a machine cancel on September 29, 1967, signed by artist Paul Calle, who designed the stamps. |
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| The “Space Twin” stamps block, issued on September 29, 1967, signed by artist Paul Calle, who designed the stamps. |
