Congo (Republic of) - 1977 - Nb 458/462 - Hot-air balloons - Airships
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Yvert No. 458/462
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Yvert No. 458/462
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Yvert No. 1703/1708
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Yvert No. 1699/1702
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Yvert No. 1675/1678
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Yvert No. 1709/1712
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Yvert No. 1717/1720
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Yvert No. 1830/1832
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Yvert No. 1781/1784
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Yvert No. 1725/1728
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Yvert No. BF154
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Yvert No. 1679/1682
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Yvert No. 1797/1800
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Yvert No. 1765/1768