Ryakushiki GUNTO 略式軍刀, Family crest Habaki, Japanese Army Officer Sword

The habaki features the family crest, Yotsubishi (xxx).
The blade is estimated to date to the Edo period or the late Muromachi period.
The handle has some play.

Signature : Mumei (Unsigned)
Nagasa : 522mm (20.55 in.) 
Sori : 15mm (0.59 in.) 
Total length : 890mm (35.04 in.) 
Motohaba : 26.2mm (1.03 in.) 
Sakihaba : 18.7mm (0.74 in.) 
Motokasane : 6mm (0.24 in.) 
Sakikasane : 4mm (0.16 in.) 
Blade Weight : 420g
Total Weight : 953g