7139 W Higgins Ave., Chicago, Illinois 60656, United States
1655 N. Arlington Heights Rd., 200W, Arlington Heights, Illinois 60004, United States
PO Box 2176, Glenview, Illinois 60025, United States
Connoisseur Stamps and Collectibles, Inc
134 North LaSalle, Suite 1330, Chicago, Illinois 60602-1057, United States
PO Box 1127, Arlington Heights, Illinois 60006, United States
Chicago Philatelic Society/CHICAGOPEX
PO Box A3953, Chicago, Illinois 60690, United States
33 W. Ontario St, Apt 48A, Chicago, Illinois 60654-7774, United States
Collector's Club of Chicago
1029 North Dearborn Str., Chicago, Illinois 60610, United States
7139 W Higgins, Chicago, Illinois 60656, United States