I may be wrong, but one defining characteristic of a Straits Bugis or Malay blade vis-a-vis Sulawesi blade is the presence of a 'pinggang' (waist) on the blade. Malay blades tend to have this feature and gives the overall blade a refined flow. In contrast, the Sulawesi blades tend to be more broad and stocky. Just my 2 bits worth.
For the ringing, I think that's the mark of a tempered blade. I call it singing and I luv keris that sing! My 2 bits worth again
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