Button has blue text with registered trademark symbol, logo of an eagle, and photograph of a postage stamp with a bald eagle and a red moon, all over a white background.
This button shows a U.S. Postal Service stamp featuring an American bald eagle over a red moon that was issued on October 4, 1988. The price of $8.75 denoted a new, lower rate category for letter-sized Express Mail items, a drop from the previous price of $10.75. Though the stamp was issued for Express Mail service, it could be used on other kinds of mail. The eagle logo on the button was used by the U.S. Postal Service from 1971 to 1993, when a streamlined eagle's head logo was adopted.
Benjamin Franklin was appointed the first Postmaster General in 1775. His operation evolved into the Post Office Department in 1792, a cabinet-level department in 1872, and an independent agency in 1971, when it was renamed the U.S. Postal Service.
Source: Smithsonian National Postal Museum. (n.d.) Arago - People, Postage and the Post: Express Mail Rate Issue. Postal Bulletin (September 15, 1988).