Adding to this.
One my father Imported recently from Japan. Purchased from 刀剣開陽堂 (token kaiyodo) in Kyoto Japan.
A little mistranslation in the slide. According to the owner of the shop, Mr. Yokota, says the blade was signed off as a pseudonym of Murata as "shojyu Kanemasa" as per his book. Made at akabane arsenal in June of the 22nd year of Meiji. 1889.
Authenticated on June 8th, 2001