I have available this Miami Dolphins Riddell NFL Full Size TK helmet that has been signed by the 1972 Miami Dolphins Undefeated Team. The 1972 legendary Miami Dolphins Coach Don Shula also signed this helmet for me. This is truly a masterpiece of football history.
Here is a complete list of the signatures on the helmet:
Bob Griese, Earl Morrall, Jim Del Gaizo, Larry Csonka, Mercury Morris, Jim Kiick, Hubert Ginn,
Howard Twilley, Paul Warfield, Marlin Briscoe, Ed Jankins, Otto Stowe, Marv Fleming, Doug Crusan,
Bob Kuechenberg, Jim Langer, Larry Little, Norm Evans, Howard Kindig, Al Jenkins,
Howard Schnellenberger, Vern Den Herder, Manny Fernandez, Bob Heinz, Bill Stanfill, Jim Dunaway, Maulty Moore, Nick Buoniconti, Mike Kolen, Larry Ball, Tim Foley, Curtis Johnson, Jake Scott,
Charlie Babb, Henry Stuckey, Dick Anderson, Doug Swift, Lloyd Mumphord, Garo Yepremian, Larry Seiple, Karl Noonan, and Don Shula.

Here are a few more photos of the helmet signed by 41 of the 1972 Miami Dolphins on the helmet:

The full size helmet is in BRAND NEW/NEVER BEFORE DISPLAYED condition.

The signatures have been authenticated by PSA/DNA in a Full Letter Certificate and the PSA/DNA certification number for this helmet is: AH41228

I had PSA/DNA issue a full letter Certificate of Authenticity. Here is an image of the letter that you will receive with the helmet:

About the Riddell TK helmet: Riddell is proud to introduce full size TK suspension helmets with 2-bar face masks as worn on-field during the 60s, 70s, and 80s. For a true throwback experience, these TK helmets offer it all. The TK consisted of a web suspension system in a rounded shell, with the iconic Riddell 2-bar face mask worn by so many great players of the past. These TK helmets strive to match the full detail of the originals. For the discriminating collector, they are a must have! Here is an image of the web suspension found inside the helmet: