One time, I saw someone with what I think was a Nambu pistol their father or grandfather captured in World War II. It was probably sitting in a drawer for decades, had rust and everything. They took it outside to try and fire it. A few people were a little worried about it blowing up given that it was so old, and the shape it was in, I was at least. It didn't fire.
Now that I think about it, I wonder what they did with it. If it were me, I would take it to a gunsmith and try and get it restored. Nambus are pretty rare from what I understand. It would be a shame if a piece of history were lost, even if they were used by the imperial Japanese.