Modern U.S. Mail: Why were some postage due stamps “VOIDED” on U.S. mail?

Keep track of news surrounding new and classic stamps of the U.S. Postal Service, and learn from in-depth insights and opinions from U.S. stamp experts.

What does it mean when a letter says “postage due”? - Quora

JQ1 - 1913 1c Parcel Post Due Stamp - Mystic Stamp Company

USA Stamps - An Overview

US Stamps - J - Postage Due for sale

USA Stamps - An Overview

United States: Postage Due Stamps

US Stamps - J - Postage Due for sale

O135 - 1983 20c Red, Blue and Black, Official Mail, coil - Mystic

$1 Postage Due U.S. Stamp Major shift error !! Mint NH price

USA Stamps - An Overview