Career
Wilhelm was one of best players of interwar Poland. Together with his older (and more famous) brother Ryszard Piec, they represented Naprzód Lipiny - a small team from a small hamlet of Lipiny, which never managed to qualify to the Polish Soccer League, but which played a significant role in interwar Polish soccer. Piec represented Poland in 4 games.
During the war, he continued playing in Naprzód, which was forced to change its name to TuS Lipine.
After the war, in 1946-1947, he played in AKS ChorzóWest
