Type A-4 walking oxygen bottle, complete with A-13 regulator for bomber aircrews. Dated 1943 on neck. All the A series oxygen masks can be plugged in with the quick disconnect system. Designed to walk away from an oxygen station to another and provide 3 to 8 minutes of oxygen at high altitude. Usually clipped on parachute's harness or flight jacket. Excellent condition. oxygen mask isn't included.

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