Dayaks in Kayaks? Parang Nabour

[Conogre]

The clamshell hilt may or may not have something to do with European inspiration, and would only be truly important if it was being used as a method of showing age, for example, with the Dutch having a long history in the region, but likewise it IS the Indian Ocean, although the sharp angles aren't a feature commonly seen on older swords with knuckleguards from India that I know of.
In regards to the clamshell itself, a similar feature is seen on the one kris in the museum in Madrid that Marc posted.
Whenever one culture came into contact with another, influences often began to appear in both directions, with even many "civilized" seamen having a flair for the exotic and incorporating it into their own personal weapons as well.
Unless I'm mistaken, the tatoo itself is an idea that originated in the S. Pacific or Indonesia as far as Europeans are concerned.
I wouldn't kick ANY of those swords out of my collection for cutting crackers, even in bed!**grin**
Mike