Mum

[bearhunter]

There are a lot of stories about grinding the mums. One I heard and sounds plausible is that the "Mums" weren't ground until it was negotiated with the Americans. Many of the rifles retained the mums when they were reissued to the Japanese home security forces and police. When the rifles were to be exported out of Japan, either as surplus or as in many cases when they were converted to 30-06 and sent to Korea.
China was making Type 99 rifles in Manchuria where the Japanese factories had been left intact. The Chinese made them in 7.92x57. I would like to get one of those but in Canada they are non existent. They definitely wouldn't have "Mums".

Other countries ground off the crests on their rifles as well. Romania, Argentina and Latvia to name a few. It isn't that uncommon. To save "face" for the emperor is as good a story as any and I won't deny it's credibility as I have no direct knowledge. I did talk to an old, now deceased armorer that spent some time in Japan, during the first months of occupation. He told me there were weapons all over the place. Most were destroyed in one manner or another and the bolts were usually missing. Bayonets, were bent etc. The Japanese, stacked and burned their weapons as well. He also said there were thousands of them just laying around, where they had been dropped, when the soldiers were told to surrender. The one thing he did notice, was a complete lack of ammunition. I guess, they had either thrown it away or used it up. There were piles upon piles of hand grenades and helmets as well. Heavier guns like machine guns were just left in their emplacements along with their accessories and many other dropped weapons. He also mentioned warehouses of equipment. Very little food but lots of uniforms and kit. He did mention that they hired Japanese labor to unpack new rifles and deface the crests. They also were told to do the same with gathered rifles. For some reason, pistols and bayonets didn't need to be defaced. Neither were uniforms, helmets, buttons, machine guns, ships, submarines or aircraft. Why not? I couldn't tell you. So many secrets die and the truth is often replaced with fantasy.
I like the story of saving face for the emperor. It's simple and easy as well as nostalgic.