My dad stopped by this past summer and learned about my WW2 collecting. I'd not shown him anything from my collection, just talked about it. This time, he got to see most of it. This year for Christmas, he surprised me with this little number.
I did a little research on these, and I "think" I've identified most of what it is. I believe this to be a type 99 Arisaka, manufactured by Toyo Kogyo sometime probably around 1940, in series 31. It shows a serial number of 3787. I've found matching numbers in a few other places on the rifle, as "787" (shown below also). There is one character before the series symbol that I can't identify though, and am hoping someone might help me with that one. I'll notate it below.
Since it still has the chrysanthemum (symbol of the emperor) I presume this must have been a battlefield capture. The bore is clean as a mirror, also has the monopod and AA sights. Quite a Christmas this year!
Here's the symbol I couldn't identify: