1987 IBM model M (1390131) Made by IBM 30 MAR 87


part# 1390131
serial# 3109092
date 30 MAR 87 (35 years old)
IBM logo silver logo with black text
cable removable, gray coiled SDL to ps/2 cable (new cable)
key caps removable (two piece, key stem + key cap)
key switches clicky = buckling spring
Designed when “real” typing on a quality keyboard was a required skill to use a $4000 IBM personal computer. PC mag link
(pre-dates the then new mouse-click and graphical user interface operating system later to be known as Microsoft Windows 3.1 and 95)
condition Keyboard pre-selected as good candidate and passed initial testing to confirm mechanical condition.  Upper keyboard case disassembled and individual 101 keys have been removed and fully cleaned by hand.  Inspection of interior plate.  All 56 plastic rivets drilled out and replaced with M2 precision screws to restore internal integrity.  Interior plate vacuumed to remove foreign debris.  Keyboard re-assembled and re-tested post-cleaning. Individual photography of rear label.
comments  Very shiny (mirror-like) curved steel plate
comments This keyboard is tested to work 100%. The keyboard assembly has been confirmed to be in functional, operational condition.
comments All 56 plastic rivets have been expertly replaced with M2 screws for ensure for a tight and crisp keyboard feel.

Includes 4 blue 7/32″ screws primarily found in 1986 model M keyboards.  Silver IBM aluminum logo (see photo)

Has red Esc key and additional custom keys with sublegends S = Spell Check, F = File Doc, T = Top Doc, C = Center, B = Bot Doc, H = Help, I = Intrpt, L = Library, M = Menu, < = Search, > = Cont Search, : = Global S/R

Keyboard has some indelible marks on top case above function keys, see last 3 keyboard photos for details.


Additional information

Weight 8 lbs
Dimensions 24 × 10 × 5 in

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