Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Estonia - Zeppelin Flight - 1933 (August 5-9), 4th SAF registered cover to Uruguay, franked by three values, tied by Tallinn ''31.VII.33'' ds, Berlin ''1.8..33'' transit, red Berlin-Friedrichshafen connection and orange confirmation markings, receiver on reverse, VF and scarce, Sieger #223, C.v. €400, Est. $250-$300, Scott #97, 112