Hi Auntie
Yep pretty nice sword you have there. Its too bad that someone unwrapped the Ito on the tsuka, if your looking to have it re wrapped correctly id give David McDonald a try, he has done a few for me and his work is top notch for stateside.
here's his link.
http://www.montanairon.com/tsukamaki.html
no need to send the whole sword just the tsuka with nuk's.
Tsuba has pine needle motif looks to be iron, tsuba guys can tell you more about it.
the same* looks good with the black lacquer the sanded to reveal the nodules, nice Koshirae all around.
Sencho is right we'd like to see pix of the blade as you may have seen in other post, full shots of the blade gives us the overall impression of the blade. out of saya, sans habaki, one where we can see the sori and sugata. Your grandfather had a good eye, as you do, nice slide show...now more blade!!