1983 AD., Poland, socialist People's Republic, Ignacy Lukasiewicz commemorative, Warsaw mint, 50 ZÅ‚otych, KM Y 146.

Poland, socialist People's Republic, Ignacy Łukasiewicz commemorative, engraver: Stanislawa Watrobska-Frindl, Warsaw mint, 1983 AD.,
50 Złotych (ø 30,5 mm / 11,63 g), copper-nickel, 11,70 g. (?) theor. mint weight, mintage 611.700 , axis medal alignment ↑↑ (0°), reeded edge,
Obv.: POLSKA RZECZPOSPOLITA LUDOWA / 19 - 83 / {mW} / ZŁ 50 ZŁ , eagle dividing date, value below.
Rev.: IGNACY ŁUKASIEWICZ · 1822 - 1882 / {SW} , his bust facing half right, engraver´s monogram over left shoulder.
KM Y 146 ; Parchimowicz 266 .

Year / Mint Mark / Mintage
1983 / mW / 611.700

Jan Józef Ignacy Łukasiewicz (1822–82) was a Polish pharmacist and petroleum industry pioneer who in 1856 built the world's first oil refinery. His achievements included the discovery of how to distill kerosene from seep oil, the invention of the modern kerosene lamp (1853), the introduction of the first modern street lamp in Europe (1853), and the construction of the world's first modern oil well (1854).
more on http://en.wikipedia.org/wiki/Ignacy_Łukasiewicz