1934, 4 air mail letters with high-value frankings, among others Michel 190 / 91 x, 233 / 34 x, , as well twice Swissair Balkan flights (SLK 34.3 C) each with additional cancellation \"take-off. Postponed\" \"at the 28. June 1934. To Pfullendorf (emergency landing) \", airmail cover to Dakar and air mail letter to Zagreb