United States 1934 Boris SERGIEVSKY Giant Sikorsky S42 Pilot Signed Flight Cover

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5c postal stationery cover, postmarked with Bridgeport duplex (Apr 27), with violet cachet of the Worlds Altitute Record / Seaplane / CAT With 2000 & 5000 / Kilo Load, signed "Boris Sergievsky" in black, wih signature of N.A.A. Observer below, unaddressed, a pleasing cover signed by this WWI Flying Ace of Russia and subsequent Test Pilot.

Inventory #2307018

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Association, & Philatelic Traders Society


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 _gsrx_vers_1436 (GS 9.0.5 (1436))