POLAND

POLAND / POLSKA.

Airplanes over landscapes.
Karkonosze Mountains.
Airmail. Fifth stamp in a set of 6, issued on 06.12.1957.
Face value: 4 złotych.
Design: Jerzy Miller (1921-1985).
Engraving: Marian Romuald Polak (?-1966).
Printed by PWPW (Polska Wytwórnia Papierów Wartościowych), Warszawa.
Printing: Photogravure and recess.
Print: 7,645,000 copies.
Size: 26 x 52 mm.

Catalogs
- AFA No. 929.
- Fischer No. 894.
- Michel No. 1039.
- Scott No. C45.
- StampWorld No. 1026.
- Stanley Gibbons No. 1039.
- Yvert et Tellier No. PA45.

Karkonosze is a mountain range located in the north of the Czech Republic and the south-west of Poland, part of the Sudetes mountain system. The Czech-Polish border, which divides the historic regions of Bohemia and Silesia, runs along the main ridge. The highest peak, Sněžka (Polish: Śnieżka), is the Czech Republic's highest point with an elevation of 1,603 m (5,259 ft). On both sides of the border, large areas of the mountains are designated national parks (the Krkonoše National Park in the Czech Republic and the Karkonosze National Park in Poland). and these together constitute a cross-border biosphere reserve under the UNESCO Man and the Biosphere Programme.

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Thanks to Sylvester Dulewski for his contribution (https://birdsposta.blogspot.com/).