Russia 2883-2889 imperf CTO

Russia 2883-2889 imperf, canceled to order, $2.10. 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.