Several people have suggested Muramasa School. This is a koto Katateuchi, "One-handed Fighting Sword" of the period. The Sugata and Hada is very much like a 1st Generation Muramasa I once owned.
Shinogi-Tsukuri Katateuchi with wide Chu-Kissaki.
Running Itame Hada stands strongly. There are two lines of Utsuri running up from the Moto area.
The Hamon is a Muramasa school, Nioi Midare Notare Ba with some Hako shapes. The Yakiba appears to weaken in the Kissaki area.
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In American Shira-Saya
Otherwise Ubu Nakago