These are the only koumiyas I have, perhaps too few to confirm my thesis, on all three the shape of the handle is such that an integrated 'hand stop' is formed. On the middle one this is very minimal. However in all three the blade against the handle is not sharp and this maximum thickness of the blade is 2.4 and 5 cm long at the inner curve. At the outer curvature, this unsharpness is much longer. That the thickness of the blade is so present on most koumiyas I have seen is in all likelihood spike for a reason. If the hand does slide off the blade under impact those blunt edges are there to keep the hand from doing damage, admittedly limited but still.
Regards
Marc
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