^ As my friend explains, the term "binangkoko" is used around the negros area to differentiate the heavier and locally produced Ginunting and the Luzon blades of similar shape.
He says that the people he trains with (the Dekiti Tirsia Siradas camp) are adamant about the difference between a negros/visayan-made blade being called a ginunting only, and making a point to differentiate that between the lighter blades of similar shape made in Luzon which they call Binangkoko.
Of course, I have no knowledge of the luzon term for this may be. Maybe even they would call it a "ginunting" and not see the difference. I've asked a few of my relatives from my father's side of the family (ethnically they are tagalog) and they've never heard of the term "binangkoko". I have a friend who speaks bisaya and he's heard that term used before but doesn't remember which context, but at least we have that.
PS: Thank you all for the kind words. I don't have many Luzon pieces so i figure I may as well collect the nice ones when I can find them. Does anyone have an approximate date of manufacture on this?