We had one of these things in the back room of an alumni development office that I worked in >15 years ago, which was used to sign appeals and thank-you letters

We had one of these things in the back room of an alumni development office that I worked in >15 years ago, which was used to sign appeals and thank-you letters to big donors. It could only duplicate the university president's signature, whose office was about a 15-minute walk away and was usually too busy to sign stuff like this. I was surprised when I first saw it, because I assumed printing technology could do a pretty good job of approximating a signature. I was told nothing could copy pen on high-grade paper.