Hi All
I'm new to the straight world, and starting with a challenge.

On a recent trip to Japan, my GF found her old Great gramps kamisori, with wooden box and stone.
brought it back home and I'm on a mission.

1) to know as much as possible, such as manufacturer, approx year
2) to restore it as much as possible.

Posted this to badger and blade earlier, but there was not a lot of help there, as I get the opinion is more DE based.
Could you please help?

some pictures.
ojiisan kamisori - Imgur
ojiisan kamisori 2 - Imgur