Lembork or Leba Poland
Proper spelling is Lębork and £eba (both relatively close to Słupsk, North of Poland).
Last name Michalski is very popular in Poland (over 51K Poles with that name).
In pomorskie province, where Lębork and £eba are located, there are 3-5k Michalski's.
With any luck some of them might be relatives of Zigmont/Zygmunt Michalski