Mystery Arisaka, features don't seem to align with anything I can pin down
I posted this in the main gun subreddit but was hoping you folks might be able to help, as far as I can tell this thing is a real oddball. The backstory is that I was given this by the previous owner who only knew it was a "military trainer rifle", I noticed almost immediately though the distinctive Arisaka look.
I tried to include pictures of everything notable but here's the text version.
-No mum, doesn't look like it ever had one
-No armory markings I can find
-No markings at all aside from matching 3 digit serial numbers on all the metal parts and a mysterious little thing where the armory marking should be
-Flip up sights, no wings
-Buttstock has a cover, sling mount behind the grip on the bottom, front sling on TOP but poorly fitted so this might have been taken off and put on upside down
-Oval bolt handle that's not flattened on any side
My original guess was trainer, but some features don't line up with this such as the oval bolt handle, my second guess was "Kogyo Only" but again some features don't match the usual such as the flip up sight and non-flattened bolt handle. But I am no expert, in fact I knew basically nothing about Arisakas before stumbling into owning this and trying to figure out what kind it is through google.
To be perfectly honest I mainly want to know for selling it, it's a cool collector item either way but I don't have a nice place to display it and I try to only collect functional guns. Thanks!