Combined they have won a total of 17 Super Bowls! They are: John Harbaugh (1), Tom Flores (2), George Seifert (2), Tony Dungy (1) Member of Pro Football Hall of Fame, Dick Vermeil (1) Member of Pro Football Hall of Fame, Bill Parcells (2) Member of Pro Football Hall of Fame, Bill Bilichick (6), Bill Cowher Member of Pro Football Hall of Fame (1) and Mike Holmgren (1). The signatures are guaranteed to be genuine and come with a Certificate of Authenticity.This item is an original, authentically signed piece of NFL history. I can usually correct any reason for you dissatisfaction. Thank you looking and good luck!