Here is my Berwyn sign in its new home! It had some green paint on the black mount and some on the sign itself that the city must have slopped all over it when painting poles decades ago. I cleaned it up with some 0000 steel wool and denatured alcohol. The paint came right off with some scrubbing leaving the enamel perfect underneath. Some anchors for the wall and screws with washers and wala!
Signs seem to be coming out of the woodwork. I think people are seeing how much they are bringing and now want to cash in. Maybe seeing the results on this website? Google search Chicago street sign and the first hit comes up from this site.