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There are recent requests to improve the article - now that I have placed an English version - , in an encyclopedic style. It shows that it raises some interest. However, only postmarks collectors can appreciate it. After so many years of collecting stamps of the Austrian monarchy, I am not aware of another reference of this quality and importance. All main auction houses base their valuation on the points Mueller, for this very specialized area of philately.
Other countries (Old German States for ex.) give a points system but not a double (rarity x popularity). This principle can be applied to many collections.
I just checked if the book (issue 1961) contains a list of sources: Edwin Mueller mentions explicitely only Hans Kropf "earliest book dealing with the 1850 issue, more than 60 years ago", unknown to most collectors.
Regarding the style of leading text, I would appreciate it if a Wikipedian would start the formal work, so that I can understand what is missing.
