deskthority

This is the "Goedhart Visicom teksttelefoon", probably the Visicom II, a text telephone for the deaf and hearing impaired made by the Dutch company Goedhart Electronics in 2004. The design seems to from 1999, at least that's the date on the controller daughterboard.
The Visicom could - and possibly still can - be used to transfer text over an ordinary telephone line between Visicom users. As soon as one letter is typed it appears on the other user's screen. It works in a kind of a half duplex mode: only one user should type at the same time but both users could type simultaneous. That, however, would result in gibberish. Typing an "X" would tell your communication partner that you are done writing and it's his turn. That's why the X legend is red. The double stepped, red keys on the top of the keyboard are function keys to control the Visicom's interface.
Apparently, there used to be an operator service run by the Dutch national telephone company (PTT, later KPN) that would translate messages between teksttelefoon users and normal, i.e. audio, telephones.
The keyboard's keycaps are double-shot and have an inverse cross mount. The red function keys are pad-printed. There are no stabilizers present except under the space bar.
On the inside, there is a large PCB supporting the switches. It's made by DS Electronics (now Printec-DS). The switches are new to me. They are silicon domes over carbon contacts. These carbon contacts are part of the PCB, and the switch housings with sliders are mechanically locked into the PCB. No soldering is required. In fact, the only soldered contacts are on the connector to the controller daughter board.
I couldn't find these switches on Printec-DS' website but according to a representative, this is the "S7" switch family which is still in production.
The Visicom still seems to work: I've connected it to a monitor and fired it up, and I could navigate the interface. Maybe I should connect it to my telephone line and call someone
edit: the date on the controller is 1999 (not 1994).

I really like the colour scheme

nice ! How do the switches feel ? How should these be called ? Is that "slider over rubberdome" ?

J.

what a nice little keyboard

The switches feel very rubber-domy and quite scratchy if hit off-center. Not really refined but I think that was not the intention here.
The keyboard layout looks nice at first but the position of the enter key is totally wrong. It's one position too far to the left: under your pinky. I guess there was not enough space to fit in a full home row + a cursor diamond.

Delightful colourscheme and font.