Rare vintage industrial keyboard assembly featuring a genuine Micro Switch SD-16200 Hall effect keyboard mechanism with original encoder electronics and extensive editing/function key layout. Dated December 3, 1980, this is a substantial early workstation or word processing keyboard believed to have originated from a professional terminal or dedicated text processing system.

Unlike common membrane keyboards of the era, this unit uses high-end Hall effect switch technology, prized by collectors for durability, feel, and historical significance. The keyboard retains its original internal PCB assemblies, encoder circuitry, connectors, and keycaps.

Notable features include:
• Micro Switch CPS SD-16200 PCB
• Hall effect key technology
• Date stamp: 12/3/80
• Integrated encoder electronics
• Unusual professional editing keys including RULER PRINT, TEMP MARGIN, CENTER, DECML TAB, LINE INSERT, CHAR DELETE, ERASE LINE, etc.
• Large 20-key function row (F1-F20)
• Original blue interface/interposer connector assembly included
• Heavy industrial construction
• Made in U.S.A.

Markings observed:
• Micro Switch SD-16200
• P/N 013-0720-02
• Serial number label present
• Micro Switch Freeport, Illinois USA markings throughout assembly

Physical condition:
Keyboard remains in good vintage condition overall with expected age-related wear, dust, discoloration, and cosmetic imperfections from storage and use. Keycaps and legends remain very attractive overall. Untested and sold as-is due to age and lack of original host system.

This is an excellent candidate for:
• Vintage computer collections
• Terminal restoration projects
• Hall effect keyboard collectors
• Industrial design collections
• Word processor/workstation preservation
• Custom interfacing projects

A very uncommon early 1980s industrial keyboard assembly that rarely surfaces complete in this configuration.

Please review all photographs carefully for condition and completeness.