The 50th Anniversary of the first man on the Moon envelope was flown aboard the ISS.
On board the ISS, the cover was marked with the “ISS” octagonal board seal, the “Russian Post. ISS. Russian Segment” round board post mark and the “Russian Segment of International Space Station” board souvenir seal both dated 21 July 2019, the day when in 1969 Neil Armstrong stepped on the Moon at 02:56 UTC. The ISS’s crews work on board by UTC. The cover was autographed by all 6
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