It could be a police saber or civil officials sword. See my webpage at:
http://home.earthlink.net/~steinrl/civilian.htm
I do not believe it is a military sword. See the military swords page at:
http://home.earthlink.net/~steinrl/military.htm
I also think the date too early. More likely from the 1930-45 period.
Rich S
The Japanese Sword Index
http://home.earthlink.net/~steinrl/nihonto.htm