The letters/numbers etched into the fuchi are a bright brass color while the surface has a red tint in places, but is it a single solid piece of brass. The camera angle and lighting make the tinted area to appear as a second metal piece. I hadn't seen that before. The clip hole is so thin at one point, if you zoom in, you'll see the crack/break point. Some type of modification or repair was done. The estimate of being made in 1942 is helpful. The larger Japanese army units on Guam in 1944, deployed to the island from China. I'm not sure it they went back to the homeland, but I will now look into units that formed and deployed in the 1942/43 time frame. Again, thank you for the observations.