Alan, thank you very much for your response.
I also noticed the unusual blade surface, and one of possibilities I thought of also was wootz. So I just asked you the questions I had about this possibility after you indicated it as such.
My thought about the surface was, as I wrote, manual cleaning. I meant with it cleaning in dry condition, with something like an awl. For me especially Gonjo and Blumbangan look cleaned that way. But that option alone cannot be the answer - as you say, the material itself is unusual.
(By the way, at the upper ridge of this picture, on left side of the blade, there is one of the few distinct patches of different material I noticed. There seems to be another bigger one at the last Luk on the reverse side. I think, it's Pamor material and what we mainly see is just the Slorok left.)
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