Tk youMasakane - usually the back side kanji is steel type but here it's their logo.
Tk you for help and clarify the other knife also ,I will provide another foto soonTo be fully accurate - Minamoto no Masakane 源 正金
As for the nakago, impossible to make out other than the second kanji maybe being 米. Need much better/closer shot, and seeing the whole knife may help.
Tk youGood job. I had thought of it possibly being Tsukiyama but their knives are all engraved just 月山。So I dismissed it.
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