RUSSIA, 1933 (Sep 2-12), 6th South America Flight, registered cover from Leningrad via Friedrichshafen to Recife, Brazil, franked with numerous airmail issues, all proper postmarks and backstamps; the Leningrad-Berlin handstamp at top left is uncommon, Very Fine. Sieger No. 229. Est. 500 - 750 CHF (via Philasearch.com: 15 Harmers Auction SA - item 9267-A12-809)
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