Question:
Where was Stefan E. Warschawski educated in Jun, 1925?

Context:
 Stefan E. Warschawski attended University of Basel from Jan, 1928 to Jan, 1930. 
 Stefan E. Warschawski attended University of Königsberg from Jan, 1924 to Jan, 1926. 
 Stefan E. Warschawski attended University of Göttingen from Jan, 1926 to Jan, 1928.

Answer:
University of Königsberg