Japanese rifle building is unique, and they are well made from the start. By the end of the war they made functional rifles, but the finish wasnt what anyone would pay good money for.
I have 0 series Nagoya built T-99 with original sling, but no monopod, nor dust cover. Got the Mum, leading arms and original stock finish, too.
I had a " US 30-06 " swacked T-99 that was done for the Korean military, and was issued as the US M-99 I belive. These conversions were done overseas with left over T99's for the Korean War. The one I had was also an early war 2nd series Nagoya. It was part of my US rifle collection.
The conversion was to push the magazine wall out a bit, put a notch in the receiver, so the longer 7.62X63mm (metric 30-06) could be easily loaded into the magazine.
Thats all I know......well, a Type 38 Carbine would be a handy thing to own......
https://bookshop.org/books/technica...se-cal-30-06-korean-war-reprint/9780934523684
Many trophys were converted here in the states by gunsmiths.
The one inthe OP is sweet and a work of art in my eyes, Id never take it along, just too beautiful;!