This cover is undated, but probably early in the war because the stamp is the regular issue, ten pfennigs, 1905, instead of the "war print." issue. And it isn't overprinted for the Belgian occupation.
The front is easy to understand. The return address on the reverse has me puzzled, mostly because I can't read the old fashioned script. Can you translate the return address? Can we identify the sender. Any help is appreciated.