This stamp shows the signing of the Declaration of Independence in 1776. Note: I do not own this stamp yet. It is here courtesy of the Wikimedia Commons.

This stamp commemorates the 200th anniversary of Delaware’s ratification of the Constitution of the United States.

This stamp commemorates the 200th anniversary of the Treaty of Amity and Commerce between the USA and Sweden.

This stamp commemorates the 50th anniversary of the Credit Union Act.

This stamp commemorates U.S. and Netherlands relations.