This pressure helmet was substituted by NASA for the one worn by astronaut Donald "Deke" Slayton on the historic ASTP mission in July, 1975.
The pressure helmet was a transparent bubble designed to attach to the spacesuit neck ring, and was constructed of a polycarbonate shell with an anodized aluminum neck ring. A vent pad/comfort pad was attached to the rear, with an emergency feed port on the side.
There were two helmet neck ring configurations used on Apollo suits which were not interchangable, the earlier configuration was anodized blue, with the later configuration being anodized red.
Transferred to the National Air and Space Museum from NASA in 1977.
Transferred from the National Aeronautics and Space Administration