I find this site dedicated to praising and selling IBM keyboards rather charming.

IBM model M keyboards.

“Are you a real computer expert or just a low-end computer user?

You need to use a real keyboard. The IBM Model M keyboard.”

They provide a short history of the IBM keyboard and include diagrams from IBM’s patent for the all-important “Bucking Spring torsional snap actuator” which gives the IBM keyboard its signature clicky sound and feel.