This is the new US Flag (2019) Booklet of 20.
With this new 2019 stamp, the Postal Service™ celebrates the American flag, the most recognizable symbol of our nation. Since its creation in the late 18th century, the Stars and Stripes has flown proudly through war and peace, stateside and abroad, and even on the surface of the moon.
The stamp features a U.S. flag, one of several on the flagpoles near the end of Chicago’s Navy Pier, waving in a May breeze.
U.S. Flag is being issued as a Forever® stamp. This Forever stamp will always be equal in value to the current First-Class Mail® one-ounce price.