"If the photos of those documents are in a proportional font, they are certainly forgeries. Only professional printing had proprotional fonts at that time. It was well into the 80s before proportional fonts came into use and even then few people had them."
I have been a software developer for over 20 years. For a period of several years I specialized in the development of laser printer forms, fonts, and the like using languages specific to the machines. I can speak as an expert witness on this topic. Proportional fonts were not available outside of a professional print shop prior to the mid eighties. All computer printers printed in fixed width fonts. The equipment and software to handle proportional fonts and superscripts were not available at that time unless you had access to a printing press.
Actually IMB Executive typewriters did use proportional fonts, according to people who have used them in the past.
IBM Selectric Composer 1968
http://www.ibm.com/Search?v=11&lang=en&cc=us&q=selectric&Search.x=0&Search.y=0
I grew up using this machine.
"I have been a software developer for over 20 years. For a period of several years I specialized in the development of laser printer forms, fonts, and the like using languages specific to the machines.
I can speak as an expert witness on this topic. Proportional fonts were not available outside of a professional print shop prior to the mid eighties. All computer printers printed in fixed width fonts.
The equipment and software to handle proportional fonts and superscripts were not available at that time unless you had access to a printing press.