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so it should be seen, you understood correctly, first expands, then narrows at the tip, proportional to the width.
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the blade is not my merit. Met on ebay, it was expensive to buy, but I wanted to try, so I did. maybe not an exact copy, but very close. But I don't remember who was the prototype.

Built about 8 years ago. Steel У8А, Okan (Cylicodiscus gabunensis)

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