Kawarizukuri 変造り TANTO, with Kozuka Kogai, Natanenurisaya 菜種塗鞘, Edo period signed

The fittings are inlaid with silver and feature cherry blossom designs.
The scabbard has a rare pattern (Natanenuri / 菜種塗).
The menuki is made of silver and has a fan design. The tang is signed but is illegible.
The blade is in a rare style.

Signature : Unknown
Nagasa : 230mm (9.06 in.) 
Sori : 3mm (0.12 in.) 
Total length : 395mm (15.55 in.) 
Motohaba : 22.8mm (0.90 in.) 
Sakihaba : 16mm (0.63 in.) 
Motokasane : 6.1mm (0.24 in.) 
Sakikasane : 5.1mm (0.20 in.) 
Blade Weight : 175g
Total Weight : 421g