I agree with DaveS, I would also put a date of about early 1900s. I also agree that the punto sleeve is silver. No need for a testing.
As far as tribe is concerned, I am leaning toward Samal based on the angle of the pommel head.
Regarding the etching, I would also suggest ferrous chloride diluted with distilled water. The blade does need to be cleaned first of rust and paint, then apply the etchant until a pattern appears (and darkened areas show), then apply baking soda to stop the etch.
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