Gustav, I am quite comfortable in saying that this blade is not from Jawa nor is it from Madura. Some of the characteristics do have a Madura appearance, but overall there is too much variation from Madura for it to fit this classification.
I do not wish to speculate on origin, but I do have a keris with very closely similar material and blade garap, ie, discounting the work in the sorsoran, and it was collected in Patani around 1920
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