1990 IBM model M (1391401) Made by IBM 03-09-90

Description

part# 1391401
serial# 6119444
date 03-09-90 (27 years old)
IBM logo black logo on white background
cable removable SDL, coiled cable, ps/2 connector (new cable, standard length)
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. Any missing 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. Photo gallery of typical restoration workflow.
comments Keyboard has had all plastic rivets removed and a 100% full bolt/screw mod for this exemplar 30-year-old model M keyboard.  Thicker, heavier chrome curved plate that was only found in early model M’s early in the production lifespan such as 1390131 and 1391401.  (see extra photos below)
comments This keyboard is tested to work 100%. The keyboard assembly has been confirmed to be in functional, operational condition.
comments  Has an added metal plate “Property of Union Pacific System TCS CONTROL NUMBER 74847”.






Additional information

Weight 8 lbs
Dimensions 24 x 12 x 3 in

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