There was a site that provided the date of manufacture and arsenal
by serial number. I don't have that info. handy. Now before I get pounded
I saw a book on Japanese rifles on, wait for it, eBay.com

. I also have seen referances on the internet, Arisaka rifle. The marking on
the receiver are the type and number of the rifle.
The bullet strike on the receiver is interesting, but I would have doubts
as shootability.