Hello Ira,
That's a really nice 19th century kampilan! (Let me know whenever you decide to part with it, please.
)
Are you sure the blade is "only" 1/4 inch thick? (Looks like it might be thicker...)
The blade most likely would benefit from a gentle polish and etch. Certainly laminated with hardened edge; many exhibit nice laminations/patterns, too.
Regards,
Kai