Color 4 x 5.75 deckle-edge postcard of a glider in flight, signed on the reverse in black ballpoint by Armstrong. In fine condition, with some light surface rubbing to image side. Signature was obtained between June 21 and July 4, 1970, at the World Soaring Championships by a Danish flyer, and is accompanied by a printout of a color photo of Armstrong at the event. Pre-certified Steve Zarelli and RR Auction COA.
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