Type 38 in caliber larger than 6.5?

[vintage hunter]

According to the s/n your rifle is an early no series T38 made at the Koishikawa (Tokyo) arsenal so it started life as a 6.5mm but could have been converted to 7,62x39 by the Chinese at a later date as Aragorn states.
It does have import marks as shown in the second photo.
You'll need to do a chamber cast and slug the bore to really be sure what it's chambered for.

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