The card is actually a residency card from the city of Posen.
I find the German Wikipedia to be useful to find these towns from Prussian Poland. A search by the German name will generally bring up the page for the Polish town that used to have that name. Carlsruhe o/s is now called Pokój. See:
Militsch is now called Milicz. See: https://de.wikipedia.org/wiki/Milicz
o/s is short for Upper Silesia.
I hope this helps,