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 rubber grommet at the point where the loom enters the housing. It retains approx. 40% of the original paint although this is rather dulled. There is some loss to the rim of the bakelite backing 'plug' but this will not affect the fit of the microphone to a mask. The switch functions correctly. Type 27's (more commonly known as the Type 28 when 'mounted' on a wiring loom) were sometimes used with the E-series and type G oxygen masks in addition to the second pattern microphone carrier masks. A good used example. Stock code O19645.