My Special QSL From Space Lab Challenger, DP0SL.

DP0SL Space Shuttle with Dutch astronauts Wubbo Johannes Ockels, PE1LFO
10/31-11/5 l985 on 437/145 MHz

First Dutch citizen in space and payload specialist on the STS-61A the West German D-1 Spacelab mission (1985, the last successful Space Shuttle Challenger mission, also the largest crew, 8 in total, 3 were licenced Amateurs).
First mission where payload activities were controlled from outside the US.