Poland
Scott #B49-B49B 1946
3z+22z School Children, 6z+24z Courtyard of Jagiellon and 11z+19z Gregor Piramowicz Founder of Education Commission International Bureau of Education Semi-Postal.
Used.
$97.50 Item #PLDB049S3
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Poland
Scott #B128 1973
10Z+5Z Copernicus 1973 World Philatelic Exposition Semi-Postal Souvenir Sheet.
Used.
$0.75 Item #PLDB128C02
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