Identify age period of this Japanese Wakizashi and if it has a crack in the mune or just an opening....Fatal?

Hello, just bought another sword I like. I am trying to determine age, and if the line on the mune is a crack, or opening, and is it a fatal flaw. The tsuba and fittings and menukies are all the same theme, and I believe are original to the sword. Please see attached images. Updated with 3 images of sword length and curve to help identify age.

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forging defect

I don't think it's a crack. Looks like a void in the forging.
It's possible that it wasn't visible until it was polished.
Or, if this is a Sengoku-era blade, then they didn't care about the defect.

It's not "fatal", but of course it reduces the value somewhat.

You should post a picture showing the overall shape of the blade.

Pete

Looks Bizen to me

Just to take a guess. It looks Bizen to me

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Ian C

nihonto.uk

Wakizashi

Thank you, I forgot to mention that the Tsuba is copper, not a strong material for battle. Wondering if the Tsuba and mounts are of a later date.

The fittings

in my opinion the fittings are better than the average quality and look late edo. A nice project :)

Ian

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Ian C

nihonto.uk

sword fittings response

Thank you again, I appreciate your information