Sneaky of you Allan
Some of you hit the nail on the head, answer is Gassan Sadakazu, jidai is Meiji period. Congrats to Jean and Alex
Both John's came very close, along with Tom.
Barry before submission to the NTHK-NPO Hayama Enshin was my my guess since he was known to make a few of these and well balanced in the various traditions, but I also thought it could have been a late shin-shinto work like some of you guessed (possibly the Yokoyama school).
Like some of you the Nakago threw me off, the Jigane was certainly indication of a late Edo Utushi and the 3 Mekugi-ana looks like it could have been re-mounted. The Mekugi-ana closest to the Machi appears to have been double punched or elongated but I think the koshirae that was commissioned for this piece (which is absolutely stunning btw) is original to when the blade was made so a lot of time went into making that nakago look like it was older.
Thank you to everybody that participated, sorry if I left anyone out. you can see a few pics of the complete set.