Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 99:
1931 (September 18-19), 2nd SAF cover, franked by four stamps, including vertical pair of the Royal couple 2fr and two air post values (total C.v. $375), tied by Triesenberg ”14.IX.31” ds, Friedrichshafen connection and violet confirmation markings, Cape Verde ”31.AGU.31” arrival markings on front and reverse, mostly VF and rare franking, Sieger #129, Est. $200-$250, Scott #107, C2, C6
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