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Thank you for your information as well! Is there a way to distinguish more "modern" swords made in the 1930's-1940's, to ones that is made in edo period?

Hello everyone, I am brand new to this and this website, but I am looking for help on this restoration project. The original owner of this sword, Gihachiro Okayome (name may be misspelled), gifted this to my grandfather post WW2 in the Philippines. Unfortunately, a family member stole this and tried to sell it, damaging it in the process. I.E., destroying the handle, wrap, and ray skin, and I think even drilling a hole in it, and they put a screw in it instead of the mekugi. And the top of Saya is smashed. It has gone untouched for about 30 years, and now I feel it would be a nice honor to both my grandfather and Gihachiro to restore it as much as possible while being respectful to its antiquity. I believe it is a Shin Gunto Type 98, army and it does have inscriptions on the handle although with the rust it is tough to see, let alone translate. What is the best way to remove rust on an antique sword like this? For the saya and handle, should I even bother restoring them or just get new wood and clean the metal decorations and put them on a new one? How would I do that? Any help would be really nice! Thank you,