Czesław Niemen (February 16, 1939 – January 17, 2004), real name Czesław Juliusz Wydrzycki, was one of the most important and original Polish singer-songwriters and rock balladeers of the last quarter-century, singing mainly in Polish. This proof legal tender 10 Zlotych coin was struck by the Polish Mint (Mennica Polska) in 2009 from 14.14 grams of .925 silver for an Actual Silver Weight (ASW) of .4205 ounces.