That marking is probably a 'rack number' applied by the nation that kept it after the war. It's likely an integer. I think there are subreddits where people can ask for translations, and this would likely give you a good clue as to the nation, or region, where it spent its post-war life.
Digging into the markings will tell you where and when it was made, but little else. So far as I know the Japanese did not unit-mark their rifles so there's just no way to know.
I think the best thing to do with it is to appreciate it, and to share that appreciation with others.
If you are so inclined, the book Flyboys is a very worthwhile read. It's an easy read, exciting and well written, and will give you some context into that theater of the war that few people these days understand. Seven bucks.
I'd also recommend the book Flyboys
That bombing mission was the mission where a number of his fellow aviators were shot down, captured, executed, and cannibalized. There's a great book about it call Flyboys. Here's some cool footage of H. W. being pulled out of the Pacific by the USS Finback.
Yup, rape of Manila too. Think one of the books I was thinking of is Flyboys: Flyboys: A True Story of Courage https://www.amazon.com/dp/0316159433/ref=cm_sw_r_cp_api_glt_i_Z2G162DH1K12GK28EJV9
It may have been, I read so many WW2 books I can remember exactly which one. Think the book Flyboys has some stories like this.
Flyboys: A True Story of Courage https://www.amazon.com/dp/0316159433/ref=cm_sw_r_cp_api_glt_i_Z2G162DH1K12GK28EJV9
Good book about it: Flyboys.
How about Fur, Fortune, and Empire: The Epic History of the Fur Trade in America. It's not military history per se, but it does cover several colonial battles, fort building, Indian wars, etc.
Right now I'm reading The Fires: How a Computer Formula, Big Ideas, and the Best of Intentions Burned Down New York City--And Determined the Future of Cities and finding it very fascinating.
Yep. Came here to suggest Flyboys. Shudder.