just means single bevel... ryoba means double bevel. So, usuba is always kataba... both higashi-gata and kamagata usuba.
I did own a Shigi ryoba kamagata usuba,I know it's not a true usuba but it was sold as an usuba.
I once owned a Shun "Nakiri" which was single-bevel, so really an usuba. Just uninformed knifemaking or semi-clever marketing. Actually, I'm not sure what to really call it as it did not have a true uraoshi.
Where's that shig ryoba now Mario?
yeah... fyi, urasuki is the hollow ground back side and uraoshi is the sharpening method for that side
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