The IBM 4683 POS matrix keyboard is an ortho from IBM - acquired by SharktasticA.
KBD.news Published August 9, 2021
This is an IBM 4683 matrix keyboard. It's from '80s, the internal assembly is made by Key Tronic for IBM. It also included a template kit and ‘windows’ for use with making labels for the keycaps.
[It] uses Key Tronic’s Foam & Foil capacitive switches – supposed to be the tactile variant but it actually feels like very stiff linears – SharktasticA
The IBM 4683 is noteworthy for being the first PC/'x86'-based point of sale retail system from the company and for being a large vintage ortholinear keyboard/macropad, although even earlier ortho keyboards from IBM are known, such as the 254-key IBM Multi-Shift Kanji Keyboards of the '70s.
(This was succeeded by the IBM Model M11 Modifiable Layout Keyboard in 1993, which was a dome with slider keyboard with an integrated magnetic stripe reader.)