500th Anniversary (in 1973) of Nicolaus Copernicus 1974-1977
Regular and Airmail Stamps (May 24, 1974)
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Sc 680 / YT 743
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Sc 681 / YT 744
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Sc C415 / YT PA530
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Sc C416 / YT PA531
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Sc C417 / YT PA532
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Sc C418 / YT PA533
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Sc C419 / YT PA534
Souvenir Sheet (May 24, 1974)
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Sc C420 / YT BF40
Surcharge (1976)
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Sc 695 / YT 750A
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Sc C444 / YT PA550
50th Anniversary of Linderbergh’s Solo Transatlantic Flight from New York to Paris 1977 (July 6, 1977)
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Sc C460 / YT PA561
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Sc C461 / YT PA562
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Sc C462 / YT PA563
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Sc C463 / YT PA564