These stamps commemorate the 400th anniversary of Columbus’s voyage and are highly valued when found on original registered covers. 1873 Official Proof Sheets O68P3-O71P3 on India Paper ...

A famous invert error stamp has sold for well over its estimate at a New York sale. Discover the upside-down 1c Pan-American ...

On Friday, the United Nations Postal Administration (UNPA) released a commemorative event stamp sheet to rejoice next Chinese ...