S23611

Boblingen Flight 1929 - letter with great switzerland mixed postage sent from Romanshorn 31.X.29 to Friedrichshafen (with zeppelin board mark 3.11.1929 instead of the Friedrichshafen postmark, in this kind a unique thing!!) and carried by airship on it' s Flight to Boblingen 1929 (arrival postmark backside, a very interesting letter with certificate by Leder, BPP, Sieger 48 A (Switzerland), Michel Zeppelin specialized catalogue 46 b (Switzerland)