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

5259 - 2018 First-Class Forever Stamp - Black Heritage: Lena Horne

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