AUGSPURG RIEKE & C.a / GUADALAJARA
Using retroreveal.org (see image) I could make out RIEKE & C.a Then, searching Google, I ultimately found AUGSPURG RIEKE & Cia. I found 4 references to that business in Google, from 1860-1872. I then searched “AUGSPURG RIEKE” in
http://www.hndm.unam.mx/, which allows full text search of 600 plus Mexican newspapers, and found 65 references from 1855-1994.
Retroreveal is a wonderful site that produces numerous versions of a color image showing different color separations and often lets you read things that are not readable otherwise.