Shinobigatana 忍刀, Ninja Sword in Shirasaya, Straight blade, Edo period mumei

The swords that were favored by ninjas are called Shinobigatana(忍刀).
The length is somewhere between Katana and Wakizashi (55cm to 60cm), and it is characterized by a straight blade with very few curves.

Signature : Mumei (Unsigned)
Nagasa : 592mm (23.31 in.) 
Sori : 4mm (0.16 in.) 
Total length : 860mm (33.86 in.) 
Motohaba : 29.3mm (1.15 in.) 
Sakihaba : 18.1mm (0.71 in.) 
Motokasane : 6mm (0.24 in.) 
Sakikasane : 4mm (0.16 in.) 
Blade Weight : 477g
Total Weight : 828g