Copper Fittings TANTO, Kanji 漢字 Kozuka, Homarekizu 誉傷, Edo period mumei

There is a Homarekizu(誉傷) on the Mune side of the blade.
This appears to be a cut mark sustained during combat when the blade was used to defend against an opponent's sword attack.

Signature : Mumei (Unsigned)
Nagasa : 364mm (14.33 in.) 
Sori : 3mm (0.12 in.) 
Total length : 520mm (20.47 in.) 
Motohaba : 24.6mm (0.97 in.) 
Sakihaba : 17.8mm (0.70 in.) 
Motokasane : 5.3mm (0.21 in.) 
Sakikasane : 4.1mm (0.16 in.) 
Blade Weight : 252g
Total Weight : 603g