This is an all matching, very early production example of the last ditch end of war Yokosuka Naval Yard made Special Type 99 Rifle. This crude monstrosity was made out of cast iron, the only steel used was the barrel and the bolt. The lugs of the bolt actually lock into the barrel instead of the crudely made cast iron receiver. These rifles were to be used in emergencies only and firing one could be considered an act of extreme desperation bordering on suicide. These things are matched by an assembly number. The later production examples are made even more crudely than this rifle. Never the less, this is a highly collectible Japanese Martial arm and no serious Japanese rifle collector would be without at least one example in there collection.