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Originally Posted by Nathaniel
Just reread and noticed I got my terms switched, I vote wide inset with a thin quenched edge.
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I second that. It looks to me like a piece of higher carbon edge steel with a subtle straight grain inserted in a body of more burl patterned mild carbon steel, the whole then heat treated.
If the line would have been the demarcation of differential heat treatment ( "hamon") then the burl pattern would briefly be exaggerated on that line before fading in to a completely hardened area. The fact that it does not tells us that we're transitioning to a different piece of steel instead.
Peter