I'll add this much, there was a form of Chinese grenade(?) hand delivered bomb, etc. very similar to this, which was in common use in China - but during WWII. Still, I would have my doubts about this one.
You have to keep in mind that most China was at a low level of industry in the 1940s, and the Japanese took control of most of what was present. Chinese guerilla forces made weapons out of whatever they could find, and munitions of this type were made in hundreds of styles, to be placed against targets or sometimes rolled down hills at convoys and such during ambushes.
In different regions we would occasionally see them recovered with dumped chemical weapons, either buried or dumped in rivers and lakes. You can also see numerous varieties and explanations in a couple of the National Museums in Beijing (Beijing Military Museum and the Peoples Museum of Resistance Against Japanese Aggression). If I get a chance this weekend I will look for some photos.