This question often comes up and while I can not comment on your blade, this style of engraving has been around since at least prior to 1926(see enclosed "Krieger 1926 Philippine Ethnic Weapons Plate 7.png). I have seen pictures of similarly engraved captured weapons by General Pershing from the Smithsonian, so I'm guessing this mode of design could go back to the early 1900's or before.
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