Russia 2883-2889 imperf

Russia 2883-2889 imperf, MNH, $5.50. Michel 2898B-2908B. Cosmonaut's Day 1964. First soviet sputniks, Mars 1 spacecraft, Gagarin. Leaders in rocket theory and technique: Konstantin E. Tsiolkovsky; N.I. Kibaltchitch; F.A.Tsander. Statue of balloonists. Pairs - buy 2 sets.