The Four Horsemen stamp was unveiled at the Legends Luncheon on May 19th at the College Football HoF. The stamp is part of the sheet honoring the 1920's being put out by the USPS. Joe Theisman was the featured speaker at the luncheon.
As I said, the Four Horsemen Stamp is part of a 15 stamp sheet honoring the 1920's, so there is no first day issue expected in South Bend for this stamp. Officially first day issue for the stamp sheet will be in Chicago.
I myself will be getting a few of them to get cancelled the weekend of the ND - Army game this year.
The stamps are supposed to be available for purchase by May 28th.
For more info on the stamp check out the news story on the Four Horseman stamp at the USPS Website.
HOW TO ORDER
THE FIRST DAY OF ISSUE POSTMARK