its a 30.5.
I have other examples of both versions.
Its in a Frankenstein wooden tsuba hilt, a clever design really, that has room for the locking mechanism, with original screws I believe..., I might wrap it and call it a day,
but is there a source of replica hilts? I need two fyi...
below is a photo.
I read that the earlier models had a problem getting stuck in the sheath occasionally so models after were made a little thinner at the base of the blade? I can't confirm this as I lost the page...
Someone also sharpened it very well, held the bevel and it's much sharper than my other two...
i like it.