Stores Ref. 10A/12572. Distinctive black painted 'ball-shaped' microphone housing with angular metal on/off switch mounted on the top. Complete with remnants of the original wiring loom and the rubber grommet at the point where the loom enters the housing. Retains approx. 70% of the original paint although rather dulled and grubby. The switch functions correctly. The type 27 (more commonly known as the Type 28 when 'mounted') was sometimes used with the E-series and G-type oxygen masks in addition to the second pattern microphone carrier masks. A good used example. Stock code O15287.