Good Stamps on First Glider Flight Wien Semmering 1933 Letter

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1933 Air mail cover „ Erster Segelflug Wien Semmering 1933“.
 
10, 15, 25, 30, 80 Groschen and one Shilling air mail stamps. Segelflugausstellung Robert Kornfeld, 22. 1. 33 –cancellations.
 
1.   Oesterr. Segel-Flugpost Wien Semmering Jaenner 1933 – commemorative strike.
Fine condition.