Beardsmore calls this switch family Siemens "classical", which isn't any better than "vintage".
There seem to have existed at least five series of modular keyboard switches that Siemens used for their devices and that I haven't seen used by other makers, so presumably, Siemens made them themselves:
- The PCB-mounted one you know from HaaTa's Tastatur 280. Various Siemens devices with that switch were introduced in the years 1970 till '75. Production seems to have ended in the late 1970s.
- Therafter came another PCB-mounted switch, which was used with Siemens Textsystems of the late 1970s.
- The plate-mounted switch family you are asking a name for, introduced with the Transdata 8161 terminal in 1975. Production of the T 1000 S, the last device with this switch, ended in 1990.
- The STB family, introduced in 1980 with the Datensichtstation 9750; the last Siemens device with STB switches seems to have been the PG 710, production of which ended in 1995.
- The Siemens Albis key family of the 1980s, which was only used for keypads and panels, though.
All of these switch families are "vintage", out of use for more than 20 years. Your switch is only "classical" in the sense that, for Siemens, it set the gold standard in typing comfort that they were anxious to reach when they developed the STB switch family.
It's introduction year, 1975, could serve well for the name, wasn't there the uncertainty about the Textsystem switch family. So maybe "Siemens plate-mount 1975" to make it unambigiuos? What's nice about "Siemens T 1000 switch" is that anybody who knows vintage Siemens devices immediately knows which switch you mean.
