Bonji 梵字 Horimono Long Wakizashi, 石州直綱作之 太刀ヲスリ上ル 文化六年二月吉日 signed, Edo period

Shakudo Dragon Menuki.
It is stated that this blade, originally a Tachi, was surage-treated by Sekishu Naotsuna.

Signature : Sekishu Naotsuna Korewo Tsukuru, Tachi wo Suriageru / February 1809
Nagasa : 515mm (20.28 in.) 
Sori : 6mm (0.24 in.) 
Total length : 720mm (28.35 in.) 
Motohaba : 25.7mm (1.01 in.) 
Sakihaba : 17.4mm (0.69 in.) 
Motokasane : 6.7mm (0.26 in.) 
Sakikasane : 4.9mm (0.19 in.) 
Blade Weight : 368g
Total Weight : 760g