1978 AD., Poland, socialist People's Republic, first Polish cosmonaut commemorative, Warsaw mint, 20 ZÅ‚otych, KM Y 97.

Poland, socialist People's Republic, first Polish cosmonaut commemorative, engraver: Ewa Olszewska-Borys, Warsaw mint, 1978 AD.,
20 Złotych (ø 28,8 mm / 10,17 g), copper-nickel (80 % copper, 20 % nickel), 10,15 g. theor. mint weight, mintage 2.008.900 , axes medal alignment ↑↑ (0°), reeded edge,
Obv.: PIERWSZY POLAK W KOSMOSIE / INTERKOSMOS-78 , ("The first Pole in space / INTERKOSMOS-78"), head of an cosmonaut facing half left.
Rev.: POLSKA∙RZECZPOSPOLITA∙LUDOWA∙1978 / mW / 20 / ZŁOTYCH , Polish coat of arms: eagle with spread wings (a white eagle, the national emblem of Poland), mint mark mW -monogram below r. claw, value below.
KM Y 97 ; Parchimowicz 250 .

Year / Mint Mark / Mintage
1978 / mW / 2.008.900

Mirosław Hermaszewski (born September 15, 1941) is a retired Polish Air Force officer and cosmonaut. He became the first (and to this day remains the only) Polish national in space, when he flew aboard the Soviet Soyuz 30 spacecraft in 1978. In 1978, he was chosen from almost 500 Polish pilots to take part in the Intercosmos space program. Together with Pyotr Klimuk, he spent almost eight days on board the Salyut 6 space station (from 17:27 on 27 June to 16:31 on 5 July 1978). During their time in orbit, they carried out various geoscience experiments and photographed the Earth.
They landed 300 km west of Tselinograd. Hermaszewski was awarded with the Hero of the Soviet Union title for his participation in the mission. He later became President of the Polish Astronautical Society (1983–89).
more on https://en.wikipedia.org/wiki/Mirosław_Hermaszewski