Just to clarify a few things (not necessarily corrections)...
Quote:
'Republic of China' (now Taiwan)
Taiwan is the name of an island, and is also the name of a province. The Republic of China (ROC) is the name of a country, whose main province still under its sovereignty is the province of Taiwan. This is ignoring political issues, and just looking at it from a geographical point of view.
The People's Republic of China (PRC) does not recognize the sole sovereignty of the Republic of China, and regards Taiwan as a renegade province. That is the political reality (not taking sides here).
So technically, these are stamps of the "Republic of China", not Taiwan. There ARE some stamps of Taiwan (also known as Formosa) issued during Japanese control. I know a lot of people use ROC and Taiwan interchangeably, but there is a technical difference (not related to political issues).
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Rod222 showed a nice pic of Chinese characters from his amazing philatelic archive. But I want to clarify the pic (keeping in mind the clarification I gave above regarding stamps from Taiwan and stamps from the Republic of China).
Upper left characters [Zhong Guo] -- this literally means "middle kingdom/country", and is translated as China; these characters (in their respective traditional/simplified scripts) are present in both PRC and ROC stamps
Upper right characters [Zhong Hua] -- this is a part phrase and cannot really have an exact meaningful translation but is associated with the adjective "chinese"; it is part of the name for ROC; it is NOT the translation for Taiwan -- if you go to Google translate and type Taiwan, you will see two completely different characters for "Taiwan" because it is a different word.
Middle row of characters -- no problems here, very well illustrated; but again, note it is Republic of China, not Taiwan stamps.
Bottom 2 rows of characters -- I would clarify that it is PRC (not China) and ROC (not Taiwan), because neither of these apply to Chinese stamps during the monarchy.
Just my thoughts... just minor technicalities.

k