Confederate States philately has always enjoyed enormous popularity. The stamps are interestingly printed, served a real postal purpose, and the story behind the stamps has real philatelic appeal- large nation, rent by discord, one section withdraws from union to preserve the ability to own human beings as property, the other side fights to retain the union and end slavery. If it wasn’t true it would seem unbelievable.
The stamps of the Confederate States have always been highly specialized in and have attracted some of the finest American philatelists. A fine catalog, by August Dietz, was issued fifty years ago. A wonderful reissue and expansion of this catalog has been published in 2012 by the Confederate Stamp Alliance (note the deliberate acronym- CSA- if you doubt the thesis that philatelists carry on the old fights symbolically through their collecting). It is rare that I recommend an expensive specialized catalog. With fascinating information about the stamps and postal history of this important period, along with accurate pricing, this catalog is a gem.