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

Hi all, Strange question maybe, but a friend of mine received a postcard which is apparently from the USA. However, he just cannot determine the stamp (see below). Is here anyone how can help us to find out more details about it? Where to buy and what’s the worth? Best, Padre

Book of 20 U.S. Freedom Flag 2023 Forever Stamps - Cardthartic

USPS® Forever Stamps for First Class Mail (100-Pack) — $44.99 (Reg

Postage stamps and postal history of the United States - Wikipedia

Please NOTE these are self adhesive POSTCARD stamps. You will need to use TWO of these stamps to mail a standard, 1 ounce letter, pay a bill by mail,

Barn POSTCARD Forever Postage Stamps US Postal American History, Wedding, Celebration, Anniversary (Roll of 100 Stamps)

USPS stamps about to get more expensive

New U.S. global forever stamp features African daisy

Where to Buy Postage Stamps: Post Office, Stores, and Online

U.S. 2022 Love Forever Stamps Wedding - uspsstoreonline

What stamps are currently available in the United States? - Quora

USPS Forever Postage Stamps (A Flag for All Seasons Self-Adhesive Booklet of 20)