Not nihonto.This looks like a china fake sword ,IMO.
Heres a link to one of the china sellers with same sword.
http://www.ebay.com/itm/Japanese-Milita ... 19d51c2bee
Ebay floats with them!
The tassels on shingunto or kaigunto was meant to be used that way.
On sabers from all over the world ,have knots. If you was rideing on a horse , you didnt drop the sword/saber.
The slider on the starps loocks the tassels/knots to the wrist.
This is the original purpose for knots and tassels on swords and sabers.
Very nice eleven leafs navy sword with mon. Very old blade mounted with very nice hada.
The mon is Matsunaga and I found Matsunaga Sadaichi 1892-1965.
Here is his service records:
http://pwencycl.kgbudge.com/M/a/Matsunaga_Sadaichi.htm
Maybe its his sword?
Click photos to enlarge.
I will take some better photos of the blade soon.