Musashitaro Yasukuni 武蔵太郎安国 signed Long Wakizashi, Edo period, with Kozuka

The back of the Tang has instructions on how to manufacture this sword. Very interesting.

Bat Menuki and Dragon Kozuka.
with NBTHK Certificate.

Signature : Musashitaro Yasukuni  / Shin 15mai Kobuse saku (武蔵太郎安国 / 真十五枚甲伏作)
Nagasa : 534mm (21.02 in.) 
Sori : 17mm (0.67 in.) 
Total length : 780mm (30.71 in.) 
Motohaba : 28.1mm (1.11 in.) 
Sakihaba : 19.2mm (0.76 in.) 
Motokasane : 7mm (0.28 in.) 
Sakikasane : 5mm (0.20 in.) 
Blade Weight : 490g
Total Weight : 987g