Robert, I wish there was a cut and dry way to explain the nomenclature of these pieces. again, not unlike the term binangon, these pieces are pretty much grouped based on their general appearance and usage. I, for one had quit distinguishing the difference between a binangon and tinegre based on the blade profile, for the simple fact that, growing up in Iloilo, not once have I heard anyone ever used the term tinegre, even in the farmlands where it's very common to see your local farmers carrying these pieces wherever they go; be it at the paddies, or the marketplace. It's always referred to as binangon, regardless of the blade profile.
so, going back to this piece that you have, I would apply the same concept. as far as having a guard, it would be just like the binangons; some have guards, and some don't. notice though, that the older binangons have carabao horn guards, or wooden guards. only later did you see some that have thin metal guards. I'm not sure if this would apply with this particular piece that you have.
as far as specific groupings, I'm sorry I can'y help you on that.
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