I've found this keyboard and I have no idea what it is. There's no brand or manufacturer on it. The only indications are the letters "A.D.I." and a serial number on the circuit board. It connects via a 4 pin Western plug to a computer (or whatever). Three types of key switches can be found: black stems under the single unit keys, brown ones under the two-unit keys and the space bar, and there's an actual locking switch for caps lock. As far as I can tell the black and the brown switches require the same actuation force. The stems are bent upwards slightly and compensate the slope of the mounting plate. BTW, they are slightly larger than Cherry MX stems so MX caps won't fit.
Time has yellowed the grey, thick double shot keys. You can put these caps on modern day Cherry MX switches but they cannot be used because the key mounts are too thick and won't slide into the switch housing. There are also some plastic supports in the way.
So... any idea what it is?
Here are the pictures, sorry for the dirt and the bad lighting:
The mounting plate with some caps removed. The switch stem of the num pad enter is broken:
Black switches:
The locking switch under caps lock:
A brown switch (right shift):
The dark side of the caps:
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