Twelve of the 20 pitchers who authored perfect games are represented here on NRMT official Major League baseballs. They include; Jim Bunning, Mike Witt, Len Barker, Kenny Rogers, Dennis Martinez, David Cone, Mark Buehrle, Randy Johnson, David Wells, Tom Browning, Sandy Koufax and Don Larsen, the only pitcher to achieve the feat during the postseason. All of the autographs include the dates of the perfectos in the pitchers' own hands, with Larsen including: "WORLD SERIES PERFECTION." The signatures are in ballpoint pen and avserage 8-9/10.