This one was from 2000. It's a high end programming keyboard line that's streamlined for developers and speed typists. The newer models sell for about $250 today and are designed for low friction and optimal ergonomics for speed.

When in doubt, look up the model numbers on eBay to look under "recently sold listings" and you'll get a gist. If you have a lot of old equipment, I'm sure you have a few gems mixed in with a bunch of standard stuff. A bit of research/inventory assessment will help guide you to the cream of the crop.

It's all about supply and demand with the vintage stuff. Collectors or irrationally faithful techies for their old gear can be rabid for certain vintage electronics. If you have the only one listed on eBay, it's your chance to name your price and see what the cat drags in.