This is an August 4th 2005 first day of issue with a Presidential Libraries stamp honoring the Presidential Library of Lyndon B. Johnson.
WASHINGTON – The U.S. Postal Service honored our Presidential Libraries with a commemorative postage stamp to coincide with the 50th anniversary of the Presidential Libraries Act of 1955. “The U.S. Postal Service is proud to conduct these First-Day-of-Issue dedication ceremonies at all of the nation's Presidential Libraries and Museums. These are truly national treasures,” said Postmaster General John E. Potter. “The new stamp will help honor the libraries' unique role in preserving and extending access to Presidential materials while recounting the lives and times of many of our nation's Presidents.” [SOURCE]