Sometime during the 1970s, the catalog for R-A-E Industrial Electronics had a section on the products of a manufacturer of keyboard switches. Not Cherry or Micro Switch, but one of the less illustrious ones, such as, perhaps, Maxi-Switch, Oak, or Mechanical Enterprises Incorporated (probably not the same guys as the ones who made Typit).
In this section, there was an illustration showing their selection of stock keycaps. So they had keys for ASCII layouts, and for keypunch layouts, and other common keyboard styles of the time, many of which we don't see much any more.
Sadly, although I remember it, I don't have a copy. The keys as pictured in black and white were black with white legends, and fairly small - readability wasn't great, but it was easy enough to guess what was on those keys which were hard to read.
While I don't remember enough to find a copy online, if there is one, I thought someone else here might have a copy, or at least remember it better than I do.
