Regarding the Fujiwara jû Nagayuki, the shape of this sword is typical of Sue-Kotô with koshi-zori and saki-zori with an extended chû-kaissaki. The yokote is present under the rust, which appears to be on the surface. This blade is indeed in need of professional restoration. Please do not give to any of the "so-called" polishers in Brazil. I have seen their work and they are not restorers but destroyers. This smith is not in the Takada School, but as the Meikan clearly states, circa Tenbun, Yamato. As I wrote regarding the Fujiwara jû Yasumitsu, the Fujiwara School smiths are separate from the Sue-Tegai School, but closely related to the Kanabô School. I am in the final stages of my book on Sue-Yamato smiths and would love to include this blade, but as it is out of polish and in Brazil, that does not seem possible. The same goes for the Fujiwara jû Yasumitsu. I would love to have this join my entry on Fujiwara Yasutomo. Nonetheless, I have added Yasumitsu to my Sue-Yamato Meikan at the end of my book. I am expecting the book to be in print either sometime this year or early next year. The text is in English and Japanese and has 100s of example oshigata.