Here's a piece that I think was only used in the underground service tunnels of Chicago. I believe they all came through the hands of Jim Crandall. I bought this one in 1999 and have only seen 1 or 2 others for sale since then. Chipping around the top which is common with these. $300 postpaid. PayPal no fee, check, or money order to Com574@clcillinois.edu or Rick Soller, 4086 Blackstone Ave., Gurnee, IL 60031