This is an experimental helmet, the shape being slightly different from the style used on the Apollo missions, and it does not have a comfort pad attached to the back. It was however, used by astronaut Charles Duke during training sessions.
Like the later models, this helmet is a transparent bubble designed to attach to the spacesuit neck ring, and was constructed of a polycarbonate shell with a blue anodized aluminum neck ring, an emergency feed port, and a vent/comfort pad attached to the rear.
Transferred to the National Air and Space Museum by NASA in 1978.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.