That is a Jap Arisaka Type 38 Made between 1923 and 1945 at Nagoya Arsenal.
It should be chambered in 6.5x50mm. It has been sporterized so it may be chambered in something different.
I can't tell if the mum is still intact it doesn't look like it is from your pictures.
They are brute strong actions. Not known for accuracy but they are strong as an ox. About as cute as the north end of a south bound bull dog after it got hit my a lawn mower.
More information on it here.