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strange shape of the mune


rodrig4
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Never seen this type of narrowing usually you see narrowing you describe on onokubi zukuri type construction or on sinoji zukuri blades when they want the kissaki to be reinforced. On your blade it doesn't look to be the case but ita hard to tell for sure from the pics you've provided thw taper does look to be on both sides maybe a result of polishing? 

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Hi there.
Having examined this blade, I can say that the boshi is not reinforced.
The shrinkage is fluid and homogeneous.
There is a slight curve due to the narrowing on both sides and this thinning of the ji as well as the edge of the Hamon are very straight.
Have a good day.

             RG.

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Hello.
I return to the subject of this shrunken wakisashi just before the boshi.
This blade was delivered to me with a JASMK certificate.
Here are some pictures of this blade as well as the certificate.


Cordially.

                   RG.

 

PS: 

It must be recognized that there are many kitae kizu.
I did not photograph the bare blade.

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I'm still new here and only going by something I read somewhere recently. But perhaps the thinning was an attempt to remove the curve instead of the curve being a result of the thinning. I understand the only way to correctly straighten a curved blade is to have a good sword polisher do it. But I don't know what the process would be. Maybe someone with knowledge of this will chime-in.

 

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I also suspect an amateur polish or a very severe  polish done to remove flaws. I don’t see how it could have anything to do with straightening the blade. A togishi would use a variety of tools and methods to straighten a blade but none of them would result in this appearance/outcome.

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