This is a keris panjang (literally "long keris"). It is not a weapon of war. Rather, it is a symbol of authority of Malay/Sumatran rulers. As you may have heard, keris panjang is sometimes used to execute people, by way of piecing the heart, top-down, through the shoulder clavicle.
The keris panjang I've seen are usually from the Malay or Sumatran areas. Yours is most likely sumatran, judging from the greneng. I have never seen a Javanese/Balinese/Lombok keris panjang yet.
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