Bulgaria - 1989 - Nb 3231/3234 - Mamals - Endangered species - WWF
Mint never hinged
Yvert No. 3231/3234
Mint never hinged
Yvert No. 3231/3234
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Yvert No. 512/514
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Yvert No. 401/403
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Yvert No. 1532A/1532D
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Yvert No. 968/971
Mint hinged
Yvert No. 1860/1865
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Yvert No. BF31/BF32
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Yvert No. 2548/2562
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Yvert No. PA360/PA363
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Yvert No. PA307/PA308
Mint hinged
Yvert No. 64/67