The satin blade without serrations will get you around a thousand bucks I suppose........provided it isn't beat up.
A high polished is the gold standard.
Partially serrated knocks off value and the black coating on the blade shows marks easily.
Even the rub marks from opening and closing stand out more with this finish.
I can't say with absolute certainty , but i suspect that the blades that got this treatment were not perfect after being finished.
Rather than scrap them , they got additional work to make them marketable.