Airmail semipostal stamps of Poland

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airmail semipostal

1957, Mar 28 Polish Philatelic Exhibition 1957 issue unwmk
Colnect-466-837-7th-national-philatelic-exhibition-in-Warsaw.jpgColnect-4882-681-7th-national-philatelic-exhibition-in-Warsaw.jpg
- 4z+2z bl abstract wing & letter, imperf
- 4z+2z bl abstract wing & letter

1957, May 18 7th National Philatelic Exhibition in Warsaw issue
- 4Zł bl

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