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. Retains virtually all of the original paint remaining. The switch also 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. An excellent example. Stock code O16410.