After some consideration and careful examination of the photos, I came to doubt that this keris is made of wood.
The mere fact that is very lite does not mean it is wood.
Nothing in its aspect looks like wood.
Moreover, the porous aspect tends to point to a heavily chemically corroded iron. I am not very good at chemistry but I have seen iron tools that after some acid attack turned into some kind of spongy coal that was very fragile and crumbly and this is exactly what I think it happened to this Keris.
