It might be one of those differently designed beading/ coving tools. I have one without the tapered cone shape on the back, but with just the one angled facet.
Skewchigouge has been around for some years. One of the guys at my club had one, and after I taught him to use a Skew chisel he no longer used it. You could of course regrind it to a skew, or even a point tool, which was re-introduced by John Berkeley, who taught me the skill of hand thread chasing.