Gunome-Hamon 互の目刃文 Long WAKIZASHI, 十三 signed, Late Muromachi period

Tang is signed 13(十三).
This is Kiritsuke-Mei, and is thought to be the control number when it was stored in the armory.

Signature : Mumei (Unsigned)
Nagasa : 545mm (21.46 in.) 
Sori : 13mm (0.51 in.) 
Total length : 770mm (30.31 in.) 
Motohaba : 25.7mm (1.01 in.) 
Sakihaba : 16.4mm (0.65 in.) 
Motokasane : 5.6mm (0.22 in.) 
Sakikasane : 4mm (0.16 in.) 
Blade Weight : 371g
Total Weight : 694g