Thank you for attaching the draft form.
Czechoslovakia existed from 1920 till 1993.
It would seem it was the clerk who filled out the form and your ancestor signed it. The PAWLITSCHKO does seem German spelling. What did your ancestor considered himself to be Bohemian or German?

So he was PAWLITSCHKO and your father PAVLICEK.
So was it your father that officially changed his surname?