A, hopefully, simple question here: anybody know when the Kozuka/kogatana appear on Katana? I'm not able to find anything other than Edo period. However, I think I am finding tsuba with side holes which are for Kozuka/kogatana earlier than Edo - but I am not sure if they are just holes on the tsuba or if they are for Kozuka/kogatana. But then I wonder why would these holes be there if not for Kozuka/kogatana?

Maybe there's something deeper here. The holes appear earlier for decoration and then some clever guy (or gal) thought they could fit a small knife through that hole? Any insights?

Thanks!

Go to the nmb forum. You’ll get more help there. That forum specializes in Japanese weaponry.

Thanks for that, Barrett. I didn't know there was such a forum! Is this the one you mean?: https://www.militaria.co.za/nmb/

Yes. I’m pretty sure you already posted your question there.

No problem bud. Happy to help. You’ll enjoy the expertise of the members there.