Model M keyboard
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Model M keyboards are a group of computer keyboards designed and manufactured by IBM starting in 1985, and later by Lexmark International, Maxi Switch, and Unicomp. The keyboard's different variations have their own distinct characteristics, with the vast majority having a buckling-spring key design and uniform profile, swappable keycaps. Model M keyboards are notable among computer enthusiasts and frequent typists due to their durability, typing-feel consistency, and their tactile and auditory feedback.
An IBM Model M manufactured in 1986
Unicomp Model M with removed "z" key. The buckling spring is visible.
Keycap in a French Model M
IBM Model M2, Part no. 1395713, manufactured 1992
Unicomp
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Unicomp is a manufacturer of computer keyboards and keyboard accessories, based in Lexington, Kentucky, United States.
Near-view from the side of a black Unicomp SpaceSaver 104 (UNI0P4A) keyboard
From top to bottom: IBM Model M Square Logo 1390131 (1986), Unicomp Spacesaver M UNIZPHA (2011), IBM Model M Space Saving 1392934 (1991)
Unicomp Classic 104 (UNI044A) keyboard, manufactured April 23, 2012.
Unicomp SpaceSaver (now Ultra Classic) 104 (UNI0P4A) keyboard, manufactured March 10, 2010.