From these small, incomplete images it is very difficult to form any opinion, but I think I can say that this gonjo was not made from any off-cut, it was very probably made as a separate forging, specifically for the gonjo.
When we make this type of pamor it tends to distort badly under forging, there are a couple of tricks that can be used to reduce this effect, but to take a piece of pattern welded material such as has been used in the core of this large blade, and bring it down to the size needed for a gonjo forging would cause very heavy distortion, and in the areas of pamor that have been presented for comment, I cannot see any such heavy distortion.
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