1981 AD., Poland, socialist People's Republic, Duke Władysław I Herman commemorative, Warsaw mint, 50 Złotych, KM Y 128.

Poland, socialist People's Republic, Polish Rulers Series, Duke Władysław I Herman circulating commemorative, engraver: Stanisława Wątróbska-Frindt, Warsaw mint, 1981 AD.,
50 Złotych (ø 30,5 mm / 11,60 g), copper-nickel (80% copper, 20% nickel), 11,70 g. (?) theor. mint weight, mintage 2.500.000 , axis medal alignment ↑↑ (0°), reeded edge,
Obv.: POLSKA RZECZPOSPOLITA LUDOWA / 19 – 81 / {mW} / · ZŁ 50 ZŁ · , eagle dividing date, value below.
Rev.: WŁADYSŁAW I HERMAN / · 1079~1102 · , crowned bust of Duke Władysław I Herman left within dotted circle.
KM Y 128 ; Parchimowicz 261 ; Schön 124 .

Year / Mint Mark / Mintage
1981 / mW / 2.500.000
1981 / mW / 5.000 proof

Władysław I Herman (c. 1044 – 4 June 1102) was a Duke of Poland from 1079 until his death.
He was the second son of Casimir I the Restorer by his wife Maria Dobroniega, daughter of Vladimir the Great, Grand Duke of Kiev.

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