I have found a second chinese gas mask, in better conditions, with stamps and diferent factory's mark.
This one has other factory's mark in the exhale valve. It seems to be a guy playing the flute:
This one has, as well, the tag of "arrow & gear" is the symbol of Chinese Arsenal (Republic of China):
This one is dated: 1 - September - 1939:
This one has this mark that means ''Security'' or ''Protector'' (The translation is not sure)