Suomi Zeppelin 1930 airmail cover from Finland to Germany

Graf Zeppelin airmail cover from Helsinki (Finland) to Iserlohn (Germany) 1930, franked with Michel 161 in horizontal two pairs with the postmark "Helsinki Helsingfors 24.IX.30 14", Zeppelin postmark "Suomi Finland 24.9.1930" and on the reverse the postmark "Friedrichshafen (Bodensee) 25.9.30 17-18"