I see all these worth a shots and raise you a Stamp Book BarCode. : r/USPS

If I suspect that the Forever Stamps I bought on Facebook are fake, can my local post office tell me? - Quora

Used Book in Good Condition

The Official Blackbook Price Guide to US Postage Stamps, 26th edition

Postal Bulletin 22144 - December 23, 2004 - USPS.com

United States. APC / SSK issues

Postal Bulletin 22198 - January 18, 2007 - USPS.com® - About

Is it okay to put clear tape over a barcode shipping label? - Quora

Any idea what these sharpie markings on my package mean? Just curious. Sorry if this is the wrong place to post this. : r/USPS

Delivery Confirmation

United States. APC / SSK issues

Do forever envelopes need stamps? - Quora

What's in that USPS postage barcode? « Frederick's Timelog

USA Forever Stamp - Confirmation - Mail, stamps & postal info - Postcrossing Community

From the Library of Stamp, Choose Library Stamp, Ex Libris Stamp, Book Reader Gift, This Book Belongs To, Book Stamp, Custom Book Lover Gift