I have never seen a Keytronic not be either a foam-and-foil or a rubberdome. That one is likely the latter. The older foam-and-foil switches are not terrible but not at all remarkable, their chief selling point was their very soft touch, which they do have. The rubber domes do not stand out in my mind as being especially nice ones, I think they're a cut above average rubber domes but that's not saying much. I would not prosecute unless you can get it for a song.