In 1942, the Netherlands Antilles issued a pleasant engraved set of 15 airmails. 30,000 sets were issued, and Scott '12 prices it unused at $55.50.
I continue to favor stamps of the European colonies and possessions over the stamps of their mother countries. The quantities issued for the colonies tend to be modest, and worldwide interest in them often grows at a faster rate. For the most part, stamp of the Netherlands Antilles appeals to Netherlands Colonies collectors, but as Curacao is a popular tourist destination, it's likely that in the future, interest in its stamps will grow in the Americas as well.
With about 16.6 million people, the Netherlands is the 16th largest economy in the world. It is an affluent industrial and trading nation, with a well-educated population, and an active stamp collecting community. Its annual GDP growth has averaged about 2.5% over the last 5 years, reflecting a slowing due to the global financial crisis.