Vintage Micro Switch Keyboard
Here is an example of a Micro Switch keyboard assembly. It is mounted in a makeshift housing that appears to have held a different keyboard in the past. After some Internet searches, it appears that this might be a keyboard with “hall effect” key switches that are highly acclaimed. More info here: https://en.wikipedia.org/wiki/Hall_effect_sensor
This one is from 1975 and I don’t know the original application but it is a very good feeling keyboard.