Anti-Antidote got this old IBM Model M15 from his grandfather.
KBD.news Published May 16, 2021
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Manufactured in September 6th, 1995.
The Model M15 is the only mechanical buckling-spring keyboard made by IBM that is fully adjustable in terms of ergonomic position.
According to GreenPylons, it's worth about $1K these days. Back in the early 2010s (before the ErgoDox and other split customs) they would go for $1.5K as it was one of the very few ergo mechanical keyboards available at the time.
Highlights: Split Spacebar (obviously), two arrow clusters, and numlock indicator LED without having a numlock key or numpad at all (solution: it came with an external numpad).