Some time back I have found these images in the web showing a Chinese made 75mm HE cartridge made in 1949.
The arsenal mark (open circle with “Y” and horizontal inside) on this projectile is similar to a known one but is still different.
The time frame this projectile was made falls into a very turbulent time in Chinese history and as we know arsenals were moved back and forth, renamed etc.
Some I found to be undocumented in available sources.
Asking for a positive ID of the symbol here would be a bit too much but is anybody has more ammunition items with this arsenal mark on I would be interested to hear (and see) about as that would allow for conclusions on the producht profile and the exact time frame it was used in (in my view max. till 1952).
Of course images with other arsenal marks of the period are also very welcome.