I saw Dan Rather commenting on the authenticity of the documents. The typeface was available as far back as the 1930s.
I soooo agree with you, Linky....
The IBM Selectric Composer was not a typewriter, was not called a typewriter and cost at least 10 times as much as typewriters did in those days. It was a typesetter named a composer because typesetting equipment at the time was hot type.
Where I worked we had an operator trained by IBM typeset scientific journals on the Selectric Composer. Could he type a memo on it -- possibly yes. Did he -- no he would have been fired. Not only was the machine expensive to buy, it also used an expensive one-use only film ribbon.