What you have there is a sword often referred to as a "Satsuma Rebellion" sword, the hilt style is distinctive of these.
The curator emeritus of the Japanese collection at the Royal Armouries Leeds believes these to be "Okashi To", loaned swords given out to Samurai and Ashigura in time of war. For the most part they are old blades at the end of their useful life, simply, cheaply and sometimes crudely refurbished to make them usable again. More on the type here....
http://www.militaria.co.za/nmb/topic...ellion-swords/