I had no idea Filipino weapons and even utilitarian edged instruments were so complex and interesting. 
This is a fantastic and rich history. I was so happy to find this very informative thread. I have one of these knives too. Sword? 
Big knife, let's say mine is. 15 1/2 inches for the blade, 22 inches overall. 
Bolo. I always thought. 
I'd be very interested to hear what you all think of this one.