Welcome to TreasureNet Sticks1

You are right, this is isn't easy to find on the net
You no doubt, have already visited this site
http://gotheborg.com/marks/index_jap_marks.htm
and found the porcelain of AA Vantine with the crossed flags.
I know they are the Japanese and Chinese Flags,
interposed with the Turkish Star and Crescent,
but I am going to make a wild supposition

and suggest;
We know, Vantine sourced his porcelain works, at least, from Japan.
The Japanese porcelain works used the crossed Flags as its 'Logo'.
And, following Japan invading China in the 1930's,
the works maintained the crossed Flags theme,
but obviously more introspectively 8)
This first pic shows a Japanese flag similar to your example, apparently from around 1910-1920.
This next pic shows a different style Japanese flag, apparently more likely 1920-1930's BUT notice the similar 'stipple' effect on one of the pots in the pic compared to your example.
So, I hope I have made sense

What I am suggesting is that this was made by one of the Japanese Porcelain 'Factories' which had been supplying AA Vantine at least until the 1930's.
Mike