Hello Dave,
by a blade length from 25 cm it is for sure a Lopah Petawaran, a very nice piece and I have to withdraw my previous comment that there is something missing at the handle, it don't look like this but there is still the possibility that there was once a longer extention attached at the end from the handle.
The handle isn't from wood IMVHO, look like horn or akar bahar, how is the feel in hand, warm or colder?
Look to this two threads:
http://www.vikingsword.com/vb/showth...ight=Petawaran
http://www.vikingsword.com/vb/showth...opah+petawaran
Regards,
Detlef