Western Picture Frame Company Chicago Illinois?

I don't know if this will help or not. I have an old mirror (bought at Antique store in Minnesota) and on the back is a paper label that says: Western Picture Frame Co., 2600-26?? South Union Avenue, Chicago, Ill. Item No. 1628. I too would like to know more about this company - when it was in business and for how long. At least the little information I have gives a location.