With the score at 1–1 after 88 minutes play, referee Karl Göppel awarded Basel a controversial penalty.
After the 2–1 lead for Basel the Lausanne players subsequently refused to resume the game and they sat down demonstratively on the pitch.
He played his debut for Switzerland, under coach Bruno Michaud, on 26 April 1972 in the friendly match against Sweden which ended in a 1–1 draw.
[3] Mundschin played his last game for his country on 26 September 1973 in Stadion Allmend, in front of 17,741 spectators, under coach René Hüssy.
The 1974 FIFA World Cup qualification game for UEFA Group 2 ended with a 1–0 victory against Luxembourg.