Anyone know the name of this type of switch?
it looks just like a bed-lamp switch except without the phosphorescent plunger, (and with the panel-mount bezel-nut removed) you could probably substitute a bed-lamp switch without any problems.

https://www.jaycar.com.au/240v-2a-bed-lamp-style-pushbutton-switch-spst/p/SP0735

These things were once common as dirt, you can probably still get them from a local electical parts supplier

The term "desk lamp switch" also seems to be applied to this device.