Thank you guys for the help. I was disappointed by the condition as well when I first received it. I probably wont try to have it professionally restored, but I will try to keep it from getting any worse with the care guide.
One thing I did find interesting in learning about nihonto is that ray skin is used on the tsuka. When I first examined the tsuka, I thought the sword was a mass produced, mid-20th century military sword because the ray skin felt plastic to me. Is aged ray skin supposed to feel plastic and "cheap" as opposed to like leather?