I ran across this website while searching for something unrelated.
These articles are rather long, but if you're really serious about identifying a piece, these links may be helpful.
Chinese marks:
http://gotheborg.com/marks/index-china-marks.htm
Japanese marks:
http://gotheborg.com/marks/index_jap_marks.htm
Re: Marks on Chinese and Japanese Porcelain
Thanks Britt, an interesting read,
and some lovely teaware examples.
and some lovely teaware examples.