The Wisconsin Federation of Stamp Clubs produces a first-day cover for every Wisconsin-related U.S. stamp issued in the state. A first-day-of-issue ceremony was held on June 14 at Erin Hills golf course, near Hartford, Wis.. and in conjunction with the 117th U.S. Open Championship. The WFSC is offering eight covers with similar design, one for each of the balls on the Have a Ball! pane. To mail order, send $2.50 each ($20 for set of 8) to Karen Weigt, 4184 Rose Ct., Middleton, WI 53562. Include a SASE. Make checks payable to the WFSC.