Manufactured by the Tokyo Kogyo arsenal as indicated by the symbols after the serial number. 31st series as indicated by the stamp before the SN. Earlier gun as T K started series in 1939 and continued to 1945 and only did Series numbers from 30 to 35.
As an early gun it should have a chrome lined bore and the bolt face should be chromed. Metford rifling so it may look "worn" if you are used to looking at normal land and groove rifling. As an earlier gun and not a "transitional" rifle it should also have a ladder rear sight and sight protectors on either side of the front sight. Rear barrel band will probably have a rectangular area on the bottom with a hole that's would have mounted a monopod. Front band should have a hole in the front for a cleaning rod and the stock will have a small button on the underside that was pushed to release the cleaning rod. Should have a metal butt, not a wood butt.
Cal is 7.7 Arisaka or "7.7 Jap" on the headstamp for 7.7 Japanese. Not a racial slur.
Need better pics.
Front sight, rear sight, bolt, barrel bands. Condition of wood too. Sanded / refinished stock takes a big hit in value.
Type 30 bayonet. (Normal Japanese bayonet for the period) Nagoya arsenal
Use
Markings on Japanese Arisaka Rifles and Bayonets of World War II for some markings related info.