I don't know anything about this beat up old sign I found in LaSalle, IL. It clearly used to say something other than Sieber Stop & Peek-the neon tube sockets don't seem to match up. And that old car in the sign at the top is a bit of a non sequitur as well. Was this a model shop? A car dealership? Something else?
The building it's attached to is quite plain, just a brick building with a couple of doors on it. No windows, no other signs. And it appeared to be closed up tight, too, so I feel comfortable calling it a ghost sign.