A fuchi made out of an antique yari nakago for my client from Japan, a blade restorer Ono Gonoushin. His website https://www.ono-togishi.jp/
The yari was bad quality so not a good piece was damaged.
Bevel of walls was forged so the collar has the same thickness on both sides.
The fuchi belongs to a battle koshirae which depicted tsuba belongs to.

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