Finland . 1930, Graf Zeppelin Baltic Sea Flight postcard to Denmark,. franked with 10m grey lilac "ZEPPELIN / 1930" overprint, tied by Helsinki (24 Sep) c.d.s., violet Finnish confirmation cachet, and further instructional markings in red, Friedrichshafen (25 Sep) receiver, signed Hugo Eckener in black, a lovely and scarce signed item.. Cover (Image1)

Est. US$300-400