General postal service (planned 3rd voyage), connecting mail from Austria, outer envelope for five letters franked 5 stamps of 3 Kronen, "BADEN b. WIEN", to Bremen, censor's initials and red boxed "ZENSURIERT k.u.k. Zensurstelle Wien", Vienna censor seal on reverse, Günter Wagner BPP certificate (2026): "Condition faultless. Great rarity, probably unique, previously unknown to Michel catalogue." Highest known franking from Austria, denomination probably to be added to Michel (reported), cautiously estimated future catalogue value 30.000,-