AIR MAIL and ZEPPELIN Switzerland

Quality: ✉

25.2.1935 "Erste Winterluftpost in den Bündneralpen Februar 1935" lot of two first flight covers bearing identical frankings consisting of SBK nos. F7 (cat. value CHF 130 on cover), F19 and F20, one dropped off at the St. Moritz stop and the other at the Lenzerheide stop, vf