Stores reference 10A/12572. Distinctive black painted 'ball-shaped' microphone casing 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 casing. All original paint has been removed so this could be primed and re-sprayed quite easily if required. The switch is in good working condition and the loom securing tab is still in place though corroded and lacking one screw - see photographs. The type 27 (more commonly known as the Type 28 when 'mounted' on a wiring loom) was sometimes used with the E-series, type G oxygen masks and the second pattern microphone carrier masks. Stock code O23494.