1933, 50 Gr. "Vienna Philatelic Exhibition" stamp on granite paper in mixed franking with 50 Gr. "Vienna Philatelic Exhibition" stamp on usual paper on postage exceeding tariff rate registered airmail cover from Vienna, tied by first day cancel "Vienna 23. 6. 33", to Reichenbach in the Voigtland with arrival stamp, in perfect condition, photo expertize Soecknick BPP (2017) : "genuine and immaculate", Michel 1. 160.-