It’s interesting that the typewriter used for the customization was different than the one used for the form letter.
But was the form letter typed or typeset?

.

The body was typeset and the name typewritten. In Ye Olden Days, it was not unusual for letters set in faux-typewriter foundry type to be printed on a platen press using a large, looped typewriter ribbon instead of ink, which helped strengthen the illusion that the entire letter was machine-written.
I agree with you Nick, does not look like a typewritten ribbon impression.
And, even the stains look simulated, almost too symmetrically distributed.
The crease coloring looks suspicious, I wonder if this could be a fabrication of sorts?
Dame hard to figure things out unless we actually had the piece, in hand, to examine ourselves.
Nice sample, sure reminds me of the 1950s. Like taking a step back in time.
Must be real...
Can't dig up anything on internet reference to 'Rannard's Shoe Store', but found obituary on Andrew B. Rannard, died 25 Dec 1956, VP of a Shoe store.
http://awt.ancestry.ca/cgi-bin/igm.cgi?op=GET&db=linclinks&id=I116019&ti...
My guess is that the dark part was mimeographed. I don't know what machines were in use in 1956 but in the mid sixties, in my school, we had an A B Dick. We would type on some special support (without a ribbon) and then use some chemicals to transfer what was typed onto a metal sheet (I think it was zinc) that would then be used for printing.
Yes, your first post.
> mimeographed ... some chemicals to transfer what
> was typed onto a metal sheet
Perhaps there were different types of mimeographs. In my first job I had to mimeograph a weekly newsletter and no metal sheets or chemicals (except ink) were involved.
I removed the typewriter ribbon and typed on a stencil, which felt like a sheet of waxy paper. The typewriter punched through the stencil's waxy layer, but a bottom layer which was permeable stayed intact. Then I wrapped the stencil around an inked drum. The ink would ooze through the areas cut out by the typewriter.
The waxy stencil would deteriorate after printing a few hundred copies. Perhaps the metal sheet you mentioned was used in jobs where more durable materials were needed to print larger quantities.
I just remembered that there was an optional method in which a small machine scanned the layout and created a stencil or printing plate from that scan.
If I remember correctly, that method reduced the overall quality slightly, but it made it easier to produce more complicated layouts and/or include illustrations. (If you produced the stencil directly on your typewriter without a scanner, illustrations needed to be drawed directly on the stencil, or else you needed to purchase pre-made stencil illustrations that were then cut and pasted into the stencil. I did that occasionally and it was a pain.)
Since the scanning method required the purchase of a special scanner, it was probably used mostly by larger organizations that could afford the extra expense.
Perhaps there were different types of mimeographs.
I never handled the printer but I am fairly sure it could be used as a mimeograph, i.e. you could put directly the typewritten waxed paper on it and print; that's how most handouts would have been produced. However, for our newspaper, what was typed on the waxed paper was transferred onto a plate; the same machine would then be used as an offset printer. I googled and found no reference on such machines that could do both. So far as I understand, when used as a mimeograph, the ink would have to be put inside the barrel; if a plate is used, the ink needs to be put somewhere else, I guess. I dont' remember that there were two printers but maybe it was so (the year was 1964-1965).
The following scanned complement for a Bourbaki seminar (pdf 191K) would normally be called "notes miméographiées" but I can't guarantee that the printing process was not in fact offset, on a Gestetner printer.
Captured from web.archive.org on 22 Oct 2013. view this capture