Aunt Hanks

CDV; Rud Conrad, Photographer, 34-36 Königstrasse 34-36, Berlin. Hand written on the front are ---1889 Aunt(?) Hanks(?), There is other handwriting on the back ----------15 1/2 --------1891. I can't read, but someone who understands German will probably be able to decipher it.

I would like to know what this says, and know if the surname is truly Hanks. That doesn't sound much like a German name to me.
People in photo include: Aunt Hanks