Sample of the certificate given for participation in WJY's July 2, 1921 broadcast of the Dempsey-Carpentier heavyweight championship boxing match. The eight (facsimile) signatures are: J. Andrew White, Acting President of the National Amateur Wireless Association; Anne Morgan, Chairman, Executive Committee, American Committee for Devastated France; Franklin D. Roosevelt, President, The Navy Club, plus fighters Jack Dempsey and Georges Carpentier, and finally Madison Square Garden representatives G. L. "Tex" Rickard, Frank E. Coultry, and Julius Hopp.

NOTE: A color scan, provided by Ross Allen, of the certificate issued to C. R. Vincent, Jr. is located at
Vincent Participation Certificate.
The Wireless Age, August, 1921, page 16:
Certificate of Participation