Long FUKUROYARI 袋槍, Rare style Socket Spear, Edo period mumei

Let us introduce you to Fukuro Yari.
A yari with a cylindrical tang like this is called a Fukuro Yari.

The tang of the blade is shaped like a tube and is attached to a stick when in use.
The tang of a normal spear is inserted into a hole in the stick,
but with a Fukuro-Yari, you can simply attach it to the stick and instantly complete the spear.
It seems that this design was devised because spear handles were prone to breaking.

Signature : Mumei (Unsigned)
Nagasa : 122mm (4.80 in.) 
Sori : 0mm (0.0 in.) 
Total length : 1170mm (46.06 in.) 
Motohaba : 17.7mm (0.70 in.) 
Sakihaba : 12.3mm (0.48 in.) 
Motokasane : 11.7mm (0.46 in.) 
Sakikasane : 6.3mm (0.25 in.) 
Blade Weight : 128g
Total Weight : 455g