Hi Pitt1999,
It's my understanding that the ones with a medial ridge are a more traditional and older form of the seme than the flat-bladed forms. That would fit with your estimates of age.
Some of the flat-bladed forms were made from imported British or German machetes, probably post-1900, while others were no doubt made locally (judging from their relatively crude forging). Again, this would fit with your age estimates.
The clipped point blade is a distinct oddity. It might be a rework of a broken/damaged blade, or one that had a forging flaw which needed to be removed. I've not seen a similar blade on a seme knife.
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