[RobT]

Detlif,

I also always thought that these blades came from North Africa and have been given information attributing them to the Eritrean region. Googling pengulu yields a definition of "a leader of a colonial-style village or tribe, in some islands of Indonesia" and also an alternate spelling (penghulu). I rather doubt the dagger in question has anything to do with the Karo Batak.

Sincerely,
RobT