S23737

south america flight 1934 - letter with high valuable Switzerland airmail stamps mixed franking, cancelled Romanshorn 23.VI.34 sent via Friedrichshafen and carried by airship on it' s third south america flight 1934 (Argentina flight) via Recife to Rio (arrival postmark), very good quality (small vertical bug in the letter), Sieger 254 CH, Michel Zeppelin specialized catalogue 370 CH