The IBM model M keyboard is the rare piece of electronics or computing technology which is both a "historical" vintage item and also a useful tool in today's computing environment.
Most modern "free with purchase" keyboards use lower-cost rubber-pad based technology.
IBM model M keyboards are unique in that each one is individually labeled with a serial number and the "date of birth" is printed on the back.
The Model M keyboard is a designation for a group of computer keyboards manufactured by IBM starting in 1984
Under each keyboard key there is an individual spring that when compressed converts physical force into an electrical signal.