S23644

Baltic Sea Flight 1930 - very rare postcard with high valuable Switzerland airmail stamps mixed franking, cancelled Romanshorn 14.VIII.30 sent via Friedrichshafen and carried by airship on it' s Baltic Sea Flight dropped at Riga. The card was sent back via Berlin (red airmail arrival postmark). Senders who got back cards with this mark, could sent the card once again in an envelope back to Riga, there the cards were cancelled with the Riga postmark with code letter k - this is one of the very rare postcards in perfect quality,, Sieger 88 CH, Michel Zeppelin specialized catalogue 128 I CH + postmark