Slawick twice refereed the French Cup Final (in 1921 and 1925), but is perhaps most well known for being the referee at the 1924 Olympic Football final between Switzerland and the eventual winners Uruguay.
Slawick served as a referee in the French Cup Final twice, in 1921 and 1925. However, he is particularly renowned for his role as the referee during the 1924 Olympic Football final between Switzerland and the eventual champions Uruguay.