(CNN) — The first known piece of mail sent using a prepaid stamp — “one of the greatest leaps forward in human communication” — could fetch between $1.5 million and $2.5 million when it comes up for ...

Royal Mail, the British postal and courier service began switching all snail mail stamps to barcoded stamps last year. The purpose of the barcode was to enhance security, deter stamp reuse, and ...

Sotheby’s is selling the first posted envelope to use a prepaid adhesive stamp at a New York auction in February focused on singular, rare works from the 13th century to today. The combined Mulready ...