Slight update, I sent an email to Ted Tenold, this is what he said:
I’ve looked over the images of your sword. It’s really difficult to clearly define many details from images, though you have done an admirable job in photographing the sword. It looks like it could be a candidate for restoration. Looks maybe early 17th century or perhaps very late 16th century. Could be a candidate for restoration but would ultimately require an in-hand evaluation to confirm it’s condition and workmanship.
The koshirae is little better than average quality Type 98 Imperial Japanese Army Shingunto, in which the older blade has been fitted. There were a number of professional shops that supplied officers with the service of remounting older swords into new mountings, or supplying them with newly made traditional or non-traditionally made swords as military sidearms.
He also said he is currently not accepting new projects and referred me to reach out to a local where I am located. I am going to have the blade inspected in person Friday. Happy to provide more updates