These are vintage dispatcher's sets and may include a headset earpiece.  Please contact us for a quote as each one is unique.  Price depends on condition of case, cords and mechanism.  These sets generally require a speech network or some external circuitry.  MRCS can match the equipment in the photo of your prototype's dispatcher or operator office, send us a photo and ask for a quote!

Hre's an Application Note on how tro wire and install Candlestick phones