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. 60% of the original paint although this is rather dulled. The switch functions correctly although is a little stiff. The type 27 (more commonly known as the Type 28 when 'mounted' on a wiring loom) 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 O19646.