Frog and Snake Fittings TANTO, Hotei Kozuka, Insect Tsuba, Edo period mumei

Tanto with interesting fittings.
The frog and snake fittings on the scabbard are very unusual and striking.

蝶蟻鍔 (Butterfly and Ant Tsuba)
布袋小柄 (Hotei Kozuka)
鉄一作金具 (Iron Fittings)
鳳仙花目貫 (Hosenka Menuki)

Signature : Mumei (Unsigned)
Nagasa : 257mm (10.12 in.) 
Sori : 0mm (0.0 in.) 
Total length : 400mm (15.75 in.) 
Motohaba : 27.6mm (1.09 in.) 
Sakihaba : 18.7mm (0.74 in.) 
Motokasane : 4.8mm (0.19 in.) 
Sakikasane : 3.3mm (0.13 in.) 
Blade Weight : 176g
Total Weight : 484g