Bubba-san, in reading your last response you have demonstrated why I want to be a member of this forum.
Yes, many old-world Japanese cutlery families make swords and kitchen supplies, but I'm in awe of the entire craft. There are craftsmen who make the blanks, others who become the cutlers, and makers of the saya and then the polishers. And like most sharpeners, I am drawn to the knife makers here in this forum.
I certainly plan to follow this thread as the history and possible restoration of this knife unfolds.
Edit: As for any tang stamps or icons, I usually look into aa book called "The Samurai Sword, A Handbook," by John M. Yumoto. While I am not well versed in Japanese, there is an entire chapter on the caligraphy, the inscriptions, the meanings, etc.