Stores Ref. 10A/12572. Distinctive black painted 'ball-shaped' microphone housing with angular metal on/off switch mounted on the top. Complete with rubber grommet at the point where the wiring enters the housing. Grubby but with a good proportion of original paint remaining - perhaps approx. 75% plus. Remnants of the original loom remain in place. 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. Stock code O15294.