Most keyboards from <1990 that have been treated reasonably well are still be in good working order today (or are at least repairable). It’s only really the last 25 or so years that keyboards have been on a downward cost/quality spiral.

IBM's model M keyboard is more than three decades old and built like a tank. Old model M keyboards are still in high demand on places like eBay.

My favorite freestanding desktop keyboard is still the original Macintosh Extended Keyboard[1] (the 2 is ok, but not as good as the original). I still have one in use on my linux machine. It requires a ADB to USB converter, but it's HID and so it works with anything. That keyboard is from the 1990 timeframe, so it's about 25 years old now and still works wonderfully.

[1] https://en.wikipedia.org/wiki/Apple_Extended_Keyboard

Goldtouch has a good track record and IBM heritage, http://allthingsergo.com/blog/reviews/goldtouch-keyboard-rev...