We also seriously have to consider the tremendous output of fake pieces who could have any mark, from the 1970's up until today. My personal rule of thumb is to spend at least one tenth on books, of whatever amount you intend to spend on porcelain. You will notice that your porcelain collection immediately will gain in value to yourself with whatever amount of money you spend on books about what you collect. It can also be nice to know that when you buy a book - it is not a fake. This latter is IMHO the best book there is, on the subject.
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The article on my visit to the Chinese Imperial Porcelain Factory area in Jingdezhen should also be interesting. The photos illustrating this and other articles are taken by me in 1991 and 1992 and are not published anywhere else. This information is given as an example of private conversation only and is not intended to be used for promotion of any individual piece. All opinions are the authors and are given as such with all the hazards of judging anything from a photo.