I've known about the U.S. Postal Services Forever stamps since they were issued in 2007, but I don't remember ever hearing about their Global Forever stamps until recently, when I was looking through the People's Graphic Design Archive and came across this post.
They date back to 2013 and are valid in 180 countries. Their round shape helps to differentiate them from domestic stamps.
I guess I don't send a lot of international mail!
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