The yellow stamp was supposed to be a test printing, but the printer made an error and printed some copies before he realized his mistake (the actual number of stamps printed in error is unknown). Only a few examples of this Swedish stamp were ever printed, and today, they’re worth millions of dollars. It is known as “Treskilling Yellow” in English and has become the world’s most valuable postage stamp. The mistake was in the last line of text, which was supposed to read “3 Skilling Banco” but instead read “3 skilling Yellow”. The Swedish word Treskilling literally means three-skilling, but the name of the stamp came about due to a printing error. Treskilling Yellow, officially the world’s most valuable postage stamp, was issued by Sweden in 1855. British Guiana 1c magenta, British Guiana: Estimated Value $8.3 million The estimated value of Post Office Mauritius on the red cover is over €8.1 million which was last sold in 2021. The Mauritius Post Office stamp is one of the top 100 most valuable postage stamps in the world. The Mauritius Post Office is the only institution that can produce philatelic items. The Mauritius Post Office has its philatelic bureau and an extensive philatelic museum. It is the island’s main philatelic bureau. Mauritius Post Office is a numismatic institution located in Port Louis, the Mauritian capital. The Mauritius Post Office was established by the British Colony Mauritius in 1847. Mauritius Post Office is the first post office established in Mauritius. The stamps were issued to commemorate the Coronation of King George V and Queen Victoria. The “Post Office Mauritius” stamps were issued to pay for the cost of postage for the Indian Ocean island of Mauritius. During the reign of King George V, the British empire was at its peak.

Cost of postage stamp 2021