Large sori Wakizashi questions

[George KN]

Hi all,

 

I was lucky enough to buy this Wakizashi with a large sori from a member here a while back, and it is the first Nihonto I've owned with a bohi/horimono, and also likely my oldest piece.

 

But after studying further, I've noticed some odd things I was hoping someone would be kind enough to inform me about?

 

Here's the blade, and it has a large sori, as well as two different styles of bohi/horimono:

 

 

 

For starters, I find it strange it has two different styles of groove - I wonder if the thicker one was added later to help remove some of the kizu found after a later polish? (There certainly are a few visible)

 

What's especially interesting is that within the thicker horimono are two faint lines, as well as a small third one outside the bohi:

 

 

Are these two parallel lines inside the bohi signs of a previous horimono that has been mostly removed by the wider bohi? And is the additional small third line evidence of another part of a horimono, removed during polishing?

 

 

Similarly, does the difference in the thickness of the nakago and the sharp part of the blade indicate it has been polished a lot like I think it does? If so, that's a lot of lost material!

 

Thanks,

 George