-First of all the habachi is so tight on the blade that it was impossible to remove it or simply move it on the nagako, I partly widened it without ruining the blade but it does not slide (only one cm) because if you see the part towards the nagako it is too tight ... I do not think it hides frauds, but you can see the two "steps" (Mune-machi ha-machi) between nagako and blade. -the blade has a "cutting edge line" that is difficult to guess but in some photos you can see a little. It must be a very polished blade.
-The saya (wood) has a final metal part that I do not know if it is recent or antique.
- you can see the mekugi-ana restored, I don't know if recently or in the past
Let me know your opinion about possible age (edo or koto?) and the activities on the island-shaped metal (both sides of the blade)
