British A-13A/2 Aircrew Oxygen Mask
As per the A-13A/1 with Type-51 microphone and UK MC-3A ("warning") oxygen hose conenctor, but upgraded with "Gabb" toggle harness mounted to a hard exo-skeleton.
The Gabb harness fitted to the A-13A/2 had triangular plates which required 3 pop studs per side on the helmet (previous masks used two). So, the G-Type helmet was born, replacing the F-Type helmet which only could support earlier masks requiring 2 pop studs per side.
Service Photographs
RAF Victor B.1 1959
This image shows an A-13A/2 oxygen mask in use in a Victor B1 front ejection seat.
Image from IWM. Worn with G-Type inner helmet, and Mk1A protective helmet.
Manufacturers Resources
MSA Instructions
These are the official manufaturers instructions that came with an A-13A/2 oxygen mask. They show the mask fitted to a G-Type helmet.
They also explain a common mis-conception as to why the mask has cheek flaps / chin cup... to protect against burns from extreme cold, or flash fires; not for additional sealing.
