Man that really looks like a Northgate.
It's because is *is* a Northgate, or rather a successor company that bought the rights and the manufacturing tools to produce the keyboards after Northgate went out of business.
However, the Avant was of generally inferior quality and exclusively used Alps clone switches, which are mediocre at best compared to the real thing. Also, as I mentioned, there's apparently a known problem with its "programmable" keys wherein the circuitry goes bad. It'd not a difficult fix, but an annoying issue nonetheless.
About the only thing the Avant has going for it is that it produced the only known variant of a Northgate board in matte black, like Model M13 or the rare Focus that Chyrosran is looking for.