Something Japanese

[browningautorifle]

the seller has dressed the neck down as I can see new brass and file striation marks

That sounds about right. I had a two pounder that was gunned up at the mouth and dressed it back to sell. An older guy bought it and was super happy to have it. They aren't around any more. These are far harder to find, that's why I jumped at this one when it was offered...now I think I have to make a projectile...turned out of solid aluminum I guess.