By Mine Safety Appliances Ltd. Stores reference 6D/3288. Size large. Dated 4/66. Fitted with the smaller plastic Amplivox 13100 microphone and 'quick disconnect' (QD) loop harness loops for use with metal oxygen mask hooks. A standard elasticated webbing harness has been accommodated by reversing the QD loop and utilizing the 'closed loop' side of the fitting. The mask is in super unissued condition. The rubber is copiously coated in chalk which could be easily cleaned off if required. The microphone is wired with a standard loom and connector. Stock code O22960.