Crisscross lines on a Batak knife
I own this old Batak chopping knife, the strong blade has one cutting edge and a convex section, and it shows irregular crisscross lines on a significant part of the surface. By close examination it seems that the entire surface was initially crisscrossed but it was polished towards the edge probably for maintaining the sharp cutting edge.
These lines were clearly incised for any reason and not imprinted by a vice or other clamping tool.
Regards
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