I love things like this.
Today when people open an application and wonder why certain things are measured in and about the type of "pen" used. Many people do not remember when plotters and printers actually used pens and had several colors and sizes to use.
Been working in the industry for almost 25 years so this brings back some memories and some interesting comments from end users.
Thanks again for bringing it back and displaying it for others to see and enjoy. 