Sign in front of the spacesuit. It read:
The "shining armor" of the Mercury astronauts was a modified U.S. Navy MK-IV pressure
suit. Gus Grissom wore this one during the 15-minute suborbital flight
aboard Mercury-Redstone 4 Liberty Bell 7 (July 21, 1961). The
MK-IV, with its fiberglass helmet, protected the astronaut if the Mercury
capsule's air escaped into the vacuum of space.