Commemorative cover, 9.5 x 4, with a cachet honoring the twelfth World Soaring Championship in 1970, signed on the front in black felt tip. In fine condition. 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. Armstrong is notoriously difficult to find on any philatelic covers. Pre-certified Steve Zarelli and RR Auction COA.
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