Where and when was this Type 99 made?

[Singer B]

Your rifle was made at the Toriimatsu factory of Nagoya Army Arsenal. It is an 11th series and was made in 1945.

So this rifle is most likely a "last ditch" or transition to "last ditch" rifle? I am always uncertain where the early-1945 rifles land in the "last ditch' discussions. Mine is also an 11th series (in terrific shape with all matching numbers, #684XX, defaced mum) and has all of the "last ditch" features but still has the sling swivel on the stock.