@Gakusee Regard the TJ Masamune tanto, when you used the word “upgrade it to Masamune” is not entirely correct because at Tokuho, the blade has the paper and the sayagaki by Dr. Honma that attributed it to Masamune. So at Juyo, the current Shinsa team was bold enough to reattributed it to Norishige. The last owner then ask Tanobe Sensei to wrote a sayagaki, in which he attributed to Masamune despite the Juyo paper. So at Tokuju , the Shinsa panel yielded and reverted the attribution back to Masamune. This also resulted in very unique Tokuju paper, where they spent a lot of time saying why its not the other smith rather than just saying why it is that particular smith. So my point is that its not really an upgrade if it was already a Masamune.