![B5 type1 : 1957 - 17e courrier par Ballon de la Sarre - Wien 1957 B5 type1 : 1957 - 17e courrier par Ballon de la Sarre - Wien 1957](https://www.historiaphil.com/boutique/414-large_default/B5-type1--1957---17e-courrier-par-Ballon-de-la-Sarre---Wien-1957.jpg)
N°B5-T1: Postal card "17th letter by balloon - Wien 1957"
authentified postmark "Balloon OMO-DE-DZA" (Austria) 17. Ballonpostflug WIEN 28.04.1957"
+ arrival postmark Hollabrunn 29.04.1957
Cancellation (type1) Mettlach, Saar 17.04.1957 on 12F+3 "Olympic Games 1956".
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