Dan:
I was thinking of your example a few days ago in relation to this thread. The rounded "curly" forms of decoration are relatively uncommon on kampilan and your example is unique in my experience -- definitely old (at least early 20th C) and well executed hilt and guard. In some ways the rounded curls remind me as much of vines and leaves as waves.
The guard on yours does look bird-like. Perhaps an eagle or cockatoo.
Like many of Cato's descriptions, one wonders where the term came from. He does not document his sources, and without that documentation one is left wondering if much of his information could be confirmed. Frustrating.
Ian.