I immediately checked some documents I had from the serice, typed on typewriters, to check this, and viola!
I agree with Buckhead's assessment that was only a matter of time before plenty of other people noticed the forgery. I also worked in an office environment and used IBM Selectrics and every other manner of typewriter. Heck, I remember using the original "fax" machine (I forget what it was called) in the early '80s where you put your phone in a cradle and your document on a drum which spun around.
After Buckhead's alert, I looked at the document on-line and could easily see that it just wasn't right.
Early '70s? No way.