A-463b is a button commemorating the Apollo 11 mission that took place July 16-24, 1969. The button shows images of Michael Collins, Neil Armstrong, and Buzz Aldrin, all three of which were the first men on the moon.
Inscription/Sig.
Around the button's border: "First Men on the Moon Cape Kennedy, Florida 1969"
Above the faces: "Apollo 11"
Below the faces: "Collins Armstrong Aldrin July 20th"