843mph - Mach 1

astronauts John Young and Bob Crippen launched Space Shuttle Columbia from Kennedy Space Center

test pilot

Signed by Hans Schlegel

STS-79+81 – Soyuz TM-23/24/25 FLOWN MIR cover - COA Kaleri ROSKOSMOS 843mph - Mach 1From the celebrated astrophilatelic collection of Jacques Bracke An extraordinary Mir space stationflown cover, carried in orbit for more than seven months and signed by a remarkable total of 21 astronauts and cosmonauts. This exceptional artifact unites the crews of two Space Shuttle missionsSTS 79 and STS 81with three complete long duration Mir crews associated with the Soyuz TM 23, TM 24, and TM 25 expeditions. The cover was repeatedly processed