>Curacao, is an independed (since about 4 or 5 years as far as know) country and has nothing to do with the rest of the Neterlands antilles, though they are in the same island group.

That may well be, I tend to live somewhat in the past as a stamp collector sometimes. For many years, the stamps as issued said 'Curacao' on them, and I suppose they were for general Dutch West Indies use. But the catalog now does list them all under Netherland Antilles.