Description
IBM Model M 1398609 AT Keyboard Buckling Spring 5-Pin DIN F8 Lexmark 1992
The IBM Model M 1398609 is one of the most iconic mechanical keyboards ever produced. Manufactured by Lexmark International on May 11, 1992, under IBM's direction, this full-size AT keyboard uses the celebrated buckling spring switch mechanism — the same technology that made the original IBM PC keyboards legendary among typists and enthusiasts. The 5-pin DIN (AT) connector interfaces with IBM PC AT-compatible systems, and the keyboard was made in the USA.
Specifications & What's Included
- Manufacturer: Lexmark International (produced for IBM)
- Keyboard Number (Kybd No): 1398609
- Model: Model M
- Part Number: F8
- Date of Manufacture: May 11, 1992
- Switch Type: Buckling spring (tactile and audible)
- Connector: AT 5-pin DIN
- Cable: Attached coiled cable
- Layout: Full-size (101-key US QWERTY)
- Power: +5V DC
- Country of Manufacture: United States
- Includes: Keyboard with attached coiled AT cable only — no PS/2 adapter or other accessories
Applications
The IBM Model M was the standard keyboard shipped with IBM PC AT and PS/2 desktop computers from the mid-1980s through the early 1990s. It connects directly to any system with an AT 5-pin DIN keyboard port; a passive AT-to-PS/2 adapter allows use on systems with a PS/2 mini-DIN port. Today, Model M keyboards remain highly sought after by mechanical keyboard collectors, vintage computer enthusiasts, and professionals who prefer the distinctive tactile snap and audible click of the buckling spring switch — a mechanism that has never been surpassed in terms of tactile feedback and typing feel by most users who have tried it. The 1398609 is a Lexmark-produced variant from the early 1990s and is considered authentic IBM Model M inventory by collectors. These keyboards are commonly used daily by enthusiasts on modern systems via USB adapters, and they are central fixtures in vintage IBM PC and PS/2 restorations.
This IBM Model M 1398609 AT keyboard is in used condition consistent with its age. The photos show multiple representative units from our inventory — the keycap color ranges from beige to slightly yellowed, which is normal for keyboards of this era (dated May 1992). Macro photos document the buckling spring switch mechanism by showing a keycap removed; this is for buyer reference and is not a defect. Some grime and debris are visible around the switch housings in the close-up shots, and the keycap edges show age-related yellowing and staining typical of 30-year-old keyboards. The coiled AT cable and 5-pin DIN connector are intact. The unit has not been powered up or tested at our facility but was pulled from a working environment where it was previously in use. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
IBM / Lexmark |
Model: |
1398609 |
MPN: |
1398609 |
Secondary Model: |
Model M |
Part Number: |
F8 |
Type: |
AT Mechanical Keyboard |
Switch Type: |
Buckling Spring |
Connector / Interface: |
AT 5-Pin DIN |
Layout: |
Full Size / 101-Key |
Manufacturer: |
Lexmark International |
Date of Manufacture: |
May 11, 1992 |
Country/Region of Manufacture: |
United States |
Power: |
+5V DC |
Compatible With: |
IBM PC AT, IBM PS/2 (with adapter), AT-compatible PCs |
SKU: |
7729 |
Seller Notes: |
Keyboard only with attached coiled AT cable — no adapter included. |
Condition Notes: |
This IBM Model M 1398609 AT keyboard is in used condition. Keycaps show age-related yellowing and some grime typical of early-1990s keyboards. Coiled AT cable and 5-pin DIN connector are intact. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |