RAF external wiring loom with type 20 microphone

External flying helmet wiring loom.  Stores reference 10A/10353.  Type Q loom wired to a type 20 microphone (type 21 when 'mounted' as here) ready for fitting to a type D oxygen mask.  The type 20, stores reference 10A/11994 has a black painted alloy casing and is often referred to as the '1941' pattern although it was actually introduced in October 1940. It has fairly minor paint loss on exposed edges but is in very good overall condition. Air Ministry and King's crown markings to the front face.  The light tan coloured loom is a bit tatty with fraying to the cotton sheathing, some of which has been bound with twine.  Fitted with an early brown cased bell jackplug.  All ready for your B-type helmet.  Stock code H25195.