Check ebay for similar swords, I'd guess. In my opinion, it is worth over $200, maybe over $300 with the etching. If a unit is named, it may bring more than a standard etching pattern: I didn't see one on your blade. There can be a fairly wide range in prices. I might add that at least in this area (southeast Idaho) IF you can find a sword at a gun show, it's possible it might sell cheaper than what they seem to bring on ebay.
You probably know, but the double squirrel maker logo means it's made by Eichorn.
Millman: What you have is an "extra purchase" KD 89, not necessarily NCO, most likely a "Dreijahrfreiwilliger" or "three year volunteer". Generally these guys were more likely to be somewhat richer than the average draftee, so they were allowed to buy a fancier Degen, engraved and nickel plated. They did buy their own gear as part of the deal, so they bought stuff that was nicer than the usual issue....
The arms on the basket indicate Preussen-Oldenburg and some other combined state armies, Sachen, Bayern, Wuerttemburg, and some of the other states used their own coat of arms and cyphers on their Kavallrie Degene und Palloschen.