Hello Séverin,
It's a penai, see the upper one at the attached picture (Michael Marlow) and his statement in the Sumara thread:
"The one with hair is also a Penai. They changed the top of the hilt depending on what use they had in mind (war, rituals etc.). Unlike for the mandau it seems that it always is human hair on these Penai."
This is what Michael teached me.
Regards,
Detlef