1983 AD., Poland, socialist People's Republic, Jan III Sobieski commemorative, Warsaw mint, 50 ZÅ‚otych, KM Y 145.

Poland, socialist People's Republic, Polish Rulers Series - Jan III Sobieski commemorative, engraver: Stanisława Wątróbska-Frindt, Warsaw mint, 1983 AD.,
50 Złotych (ø 30,5 mm / 11,56 g), copper-nickel (80% copper, 20% nickel), 11,70 g. (?) theor. mint weight, mintage 2.576.000 , axis medal alignment ↑↑ (0°), reeded edge,
Obv.: POLSKA RZECZPOSPOLITA LUDOWA / 19 - 83 / {mW} / ZŁ 50 ZŁ , eagle dividing date, value below.
Rev.: 300 LAT ODSIECZY WIEDEŇSKIEJ / JAN III SOBIESKI 1674-1696 , his bust facing.
KM Y 145 ; Parchimowicz 265 ; Schön 135 .

Year / Mint Mark / Mintage
1983 / mW / 2.576.000

John III Sobieski (Polish: Jan III Sobieski; Lithuanian: Jonas III Sobieskis; Latin: Ioannes III Sobiscius; 17 August 1629 – 17 June 1696), was King of Poland and Grand Duke of Lithuania from 1674 until his death, and one of the most notable monarchs of the Polish–Lithuanian Commonwealth.

Sobieski's military skill, demonstrated in wars against the Ottoman Empire, contributed to his prowess as King of Poland. Sobieski's 22-year reign marked a period of the Commonwealth's stabilization, much needed after the turmoil of the Deluge and the Khmelnytsky Uprising. Popular among his subjects, he was an able military commander, most famous for his victory over the Turks at the 1683 Battle of Vienna. After his victories over them, the Ottomans called him the "Lion of Lechistan"; and the Pope hailed him as the savior of Christendom.

More on https://en.wikipedia.org/wiki/John_III_Sobieski