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1958-59 10c Air Post Envelope, blue & red for sale at Mystic Stamp Company
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Forever stamp: USPS raising cost of first-class stamp in 2023
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Amazon.com: United States (U.S.) Scott #FA1 - 15 Cent Certified Mail, Letter Carrier Issue From 1955 - Collectible Postage Stamps : Toys & Games
USPS wants to raise the price of a first-class postage stamp to 66 cents
What postal rule forbade remailing in an undeliverable envelope?
Dead letter mail - Wikipedia
