These instrument-panel replacement bulbs were carried as part of the cockpit equipment of Friendship 7, the Mercury capsule in which John H. Glenn became the first American to orbit the Earth. Glenn's flight was the third manned mission of Project Mercury, following two suborbital flights by astronauts in 1961. Glenn's three-orbit mission on February 20, 1962, was a sterling success, as he overcame problems with the automatic control system that would have ended an unmanned flight. Glenn splashed down in the Atlantic 4 hours, 55 minutes and 23 seconds after launch.
In 1962, NASA transferred Friendship 7 to the Smithsonian Institution, along with a number of astronaut and cockpit items.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.