Chounsai Tsunatoshi 長運斎綱俊, Banzai Tsunatoshi July 1825 signed, Kaiken TANTO

A famous swordsmith active in the late Edo period. Shinshinto-Josaku (新々刀上作).
He was a disciple of Suishinshi Masahide (水心子正秀).
His Nishikizutsumi-Koshirae (錦包拵) and Kaiken (懐剣).
Includes NBTHK Shinsa paper.
The blade is treated with Umegane.

Signature : Banzai Tsunatoshi / July 1825
Nagasa : 164mm (6.46 in.) 
Sori : 0mm (0.0 in.) 
Total length : 310mm (12.20 in.) 
Motohaba : 18.9mm (0.74 in.) 
Sakihaba : 13.2mm (0.52 in.) 
Motokasane : 6.5mm (0.26 in.) 
Sakikasane : 3.7mm (0.15 in.) 
Blade Weight : 93g
Total Weight : 148g