Congrats, a very nice pakayun. The handle seems indeed original like this but I have to admit that I know not enough about this swords from the Murut people. The best expert about this swords is unfortunately not a member here anymore. But think that Michael, Maurice and Arjan can tell you more about yours. Here in the meanwhile some stuff to read and look.
http://www.vikingsword.com/vb/showth...hlight=pakayun
http://www.vikingsword.com/vb/showth...hlight=pakayun
http://www.vikingsword.com/vb/showth...hlight=pakayun
Maybe I can add that it is an old type since the brass collar is long.
Regards,
Detlef