Apollo 13 was the 3rd NASA spaceflight that was intended to land on the moon, launched in 1973. The lunar landing was aborted after an oxygen tank exploded two days into the mission forcing the crew to survive in the lunar module. With makeshift repairs the crew returned to Earth safely 6 days after launch, Round Tie Pin Metal 0.75" Lapel Hat Pin Tie Tack Pin Made of metal with the resin design shown. The pin is approximately 3/4" in diameter. It is a great gift or collector's item. Each pin is 3/4" and comes with a secure butterfly clasp so you won't lose this pin.