The blade could be an indicator of its age. I have a panabas with a similar pattern on the blade; it was made from a huge rasp file as yours may be as well. As a result of the Spanish and the American presence in the Philippines, a large chunk of good steel taken off one of their ships would certainly be tempting. Ships needing a wood rasp probably pre WW2, so in my completely uninformed opinion, the blade could date between 1890-1939; after that, there were plenty of leaf springs as already mentioned.
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