Turtle Menuki Yoroidoshi Tanto, Masamehada 柾目肌 Thick Blade, Edo period mumei

A Yoroidoshi Tanto with an interesting Kame Menuki.
The blade is 9.3 mm (0.37 in.) thick, making it very thick.
It has a rare square Tsuba and a peony painted on the Fuchi.

Signature : Mumei (Unsigned)
Nagasa : 317mm (12.48 in.) 
Sori : 1mm (0.04 in.) 
Total length : 500mm (19.69 in.) 
Motohaba : 28.5mm (1.12 in.) 
Sakihaba : 21.5mm (0.85 in.) 
Motokasane : 9.3mm (0.37 in.) 
Sakikasane : 5.6mm (0.22 in.) 
Blade Weight : 346g
Total Weight : 630g