So, Rich...
...are you saying this isn't a USPC ID? Or just that the location isn't definite, because it was a Chicago distributor, who's customer could have been anywhere. The "Garden Club" name came from the records, right?
I have a crazy idea about this one. I'll send a scan to someone who might just be able to recognize the gate. It's a long shot, but if I'm right it would be pretty neat.