This keyboard assembly was recovered from a wrecked IBM Wheelwriter 3500 bought for just £1.04! Seems that this keyboard assembly was in fact a replacement module of sorts and possibly made by Unicomp given the 2001 date.

Original specs/details

Full Name IBM Wheelwriter 3500 Keyboard Assembly
Part NumberPart Number
The number used to describe this keyboard's specific release; usually specific for a target region, language or SKU, etc.
A designation from my own type naming scheme used to categorise this keyboard with or from others by their common features and market intent but may/may not be derived from official names.
Model M-based Typewriter Keyboard Assembly
The name of the known switching mechanism that lies under this keyboard's keys.
IBM membrane buckling springs
Original KeycapsOriginal Keycaps
The keyboard's original keycaps' material and text/symbol printing technique.
PBT with dye-sublimated legends
The keyboard-to-host connection. This is could be a description of a cable (its colour, whether its coiled, whether its detachable, and what connector is at its end) or the name of a wireless technology.
Production Date 2001-07-10
Acquisition Date 2020-05-28

About this keyboard type

The 1984-debuting IBM Wheelwriters 3 and 5 and Quietwriter 7 were the first vessels of membrane buckling spring keyboards. What would become the Model M as we know them featured on all subsequent IBM and later Lexmark Wheelwriters for the next decade. The layouts of these keyboard assemblies were vaguely PC-like, with a max of T-nav arrow keys, one or two columns of left-side function keys, and occasionally even a numeric keypad section included on various models depending on their market segment. As a result, most Wheelwriter keyboards range from approximately 65 size layouts. The common feature amongst all of them was a split spacebar with the smaller "Code" key being an additional modifier for accessing functions throughout the keyboard.