Katana unsigned most likely from the late Koto period. This sword has a hamon of suguha (a bit difficult to see due to its old polish). The jigane is a nagare itame with some masame. There are a few Kizu, and what looks like a sword cut on one side. The tang is ubu, but with 4 holes (1 being a shinobi ana).
What is nice about this set, is the old koshirae. The tsukamaki is hard to discern if it is original, but none the less nice. There is a special type mekugi (see pictures) with the matching mon on the fuchi of the 3 Oak leaves favored by the Tosa Yamanouchi family. The silver fittings are a type seen in the late shinshinto period in which the sword can be worn as a katana or a Tachi. The Tachi hangers actually split apart when it is worn as a Tachi. The aogai scabbard is very nice and in good condition. The tsuba is a Nanban Hizen type with nunome zogan as well. The 2nd mount is for Iai, made up of modern fittings.