Now and then we discuss these kind of Batak "ancestor" hilts.
I have updated my collection pages with these four daggers and for those interested I have quoted passages from Achim Sibeth's highly recommended book - The Batak.
http://www.kampungnet.com.sg/modules...view_album.php
The problem with the Batak weapons is that Lake Toba became a tourist spot already in the 1890's.
So about 15 years ago the first Batak tourist items became genuine antiques.
Michael