2173 Germany: 1931 1st South American Flight Zeppelin cover franked with Polar Flight opt 4RM, tied by Friedrichshafen d/s, pictorial cachet in green, Rio De Janiero arrival b/s. SG 471 cat £950, Mi 458 cat £900 as loose stamps alone, & on cover €1100+ (P) $400 $600
2174 Germany: 1930 Zeppelin cover franked 2RM South America Flight tied by Nurnberg-Flughafen cds, oval cachet in red, Friedrichshafen arrival b/s. Mi 438 €400, SG 456 cat £425 for loose stamp alone (P) $150 $250
2175 Germany: 1931 Zeppelin Polar Flight cover franked 4RM Polar Flight tied by "Berlin Staaken 25 7 31" cds, with special red cachet & "Brise-Glace Malyguin Arctique 27 VIII 31" anchor cds. Superb fresh. SG 471 cat £950, Mi 458 cat €900, both as loose stamp, & cat €1100 on cover. (P) $450 $700
2176 Switzerland: 1930 South America Flight use of 10c Postcard uprated front & back inc Airmail 35c brown Aviator, 65c Angel pr, 75c Angel & 1Fr Angel pr, tied by "Romanshorn 16 V 30" cds. To USA with red flight cachet & green Lakehurst arrival pmk. VF. SG cat as loose stamps alone £417, plus big premium for use on Zeppelin cover. (P) $200 $400
