British A-13A/4 Aircrew Oxygen Mask

As per the A-13A/2 with Type-59 microphone and Gabb toggle harness, but fitted with Mk7 bayonet oxygen hose connector.

Service Photographs

RAF Victor B.1 1959

This images show an A-13A/4 oxygen mask in use in a Victor B1, by a rear crew member. This mask would have been connected to the oxygen system by means of a Hymatic MSC type PEC.

Image from DailyMail.