Issue commemorating the ISTUS (International Gliding Sport Federation) convention organized by the Polish Aeroclub in 1930.
The nut bears the signature ST. REISING WARSZAWA.
Signature on the obverse: H.G., designer Henryk Grunwald.
Decoration from the unique "Collection of Lviv and Galician Medals" of Lech Kokociński, Honorary President of the Polish Numismatic Society.
Bronze, diameter 15 mm, weight 3.58 g
