Gavin, i think many rulers will have a somewhat similar look. Images i have seen of Paku Buwono VII for instance, has a very similar look to his descendant PB IX.
A possible important element for identifying or dating this could be the the figure of the hilt stands atop a water buffalo. While i cannot add any information based upon this "clue" perhaps others can.
BTW, seems to be a beautiful pedang lurus. Can you show the blade? That might also aid in dating it.
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