Wow!! Sounds really interesting. Do you also own a HATTORI HANZO sword?I am told it was hand forged by Takahashi Kazumi.
I believe it comes from the same workshop as the razors sold at this page:
http://oldschoolshaving.net/Kanetake_size_1.html
The mark looks similar, though it's hard to tell since my picture pixelates when zoomed in.
Apparently he's the father of Takahashi Norikazu as mentioned in this interview from the same site:
http://oldschoolshaving.net/Interview_with_Takahashi_Norikazu.html
So this would make it a Kanetake kamisori (though it wouldn't confirm whether it was made by Norikazu or Kazumi), and I won't really know if it is a Kanetake until I receive it and take a close look at the mark.
If it is Kanetake, then it's a very nice kamisori, but apparently a notch under the Iwasaki kamisori which has the reputation of being the high end razor in Japan.