For the benefit of Simon Constable, I post the following (see below). The signature of Rudolph Valentino assigns authority to S. George Ullman (and he did use two "n's" early on). I would advise Simon Constable to respect that signature and respect that it represents Valentino's complete faith in Ullman.
For Valentino, signing this document would be one of the best decisions of his life. For Ullman it turned out to be a tremendous curse because of people like Alberto Guglielmi and Simon Constable. Sometimes I look at a picture of George Ullman and think what would he do if he knew people like Simon Constable and Tracy Terhune would come along; irrational fanatics hellbent on slandering him based on nothing.
That July 6th, long ago in 1923... in the office of the newly-minted lawyer Max Steuer, with George and Rudy present the epic story was set in motion. "The production of this letter by Mr. Ullmann will evidence his authority from me..." Take note Simon Constable.