Most/Least Complicated Countries To Collect

I have to agree with the above statement about the watermarks of BRAZIL , that's if your following the Scott album series or the Scott Catalogs .Once you get into the items that the foreign catalogs list then it becomes a diffuculty to find those items .Then there is the diffuculty of finding research material for anything not listed in any major catalog .
Each collector decides how comprehensive they want to get and even if that material is regularly on the market to be purchased .
I noticed over the years and at many stamp auctions that the material that is well researched and written up always gets bidders interested no matter the subject .

Germany with all the different shades ,can be a life time study and years of finding the correct ones.

Brazil watermarks. I find them very confusing/frustrating. At least for the most part the stamps are inexpensive.