I thought that was tambal when I first looked at it, and I guess, in a way, it is tambal, but its a new approach, I think.
From what I can see and guess, it looks as if the pamor has been welded normally, but then the separating lines have been cut into the pamor and filled with strips of black material, probably steel, because of the lower weld heat required.
The forging has then been returned to the forge and another couple of weld heats put into it to fix the separating strips in place.
Of course, I'd need to examine this blade in the hand to confirm my guess, but however it was done, the effect is a new initiative.
I've said it before:- these blokes are amongst the world's best pattern welders. Maybe the best of them are the world's best pattern welders.
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