In 1847 most countries of the world were

Any mistake made in the printing of a stamp raises its value to stamp collectors. A mistake on one cheap postage stamp has made the stamp worth a million and a half times its original value. The mistake was made more than a hundred years ago in the British colony of Mauritius,’ a small island in the Indian Ocean. [15A]In 1847 an order for stamps was sent to a London printer Mauritius was to become the fourth country in the world to issue stamps.
    Before the order was filled and delivered, a ball was planned at Mauritius Government House, and stamps were needed to send out the invitations. A local printer was instructed to copy the design for the stamps. He wrote by chance [16B]the words "Post Office" instead of "Post Paid" on the several hundred stamps that he printed.
    Today there are only 26 of these wrongly printed stamps left — fourteen One Penny Orange-Reds and twelve Two Penny Blues. Because of the Two Penny Blue’s rareness and age, collectors have paid as much as $ 16, 800 for it.