It's definitely a Japanese Arisaka Rifle, and since it doesn't have a peep sight on the receiver bridge like a Type 99 should, AFAIK that would make it an earlier Type 38.
The large round knob on the rear of the bolt is the rotating safety - push in/fwd & turn with the heel of the hand, one way or the other, to take it on/off safe.
It looks like it's had the Japanese Royal Crest ( a Chrysanthemum) stamping ground off the front receiver ring, a sure sign of a war-surrendered weapon.
The chambering/bore should tell the tale - IIRC, the Type 38 was 6.5mm (.260") & the Type 99 was a 7.7mm (.310").
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