Cased Switshboard Operator's Headset, Complete and Very Rare

The German armed forces sometimes used a chest microphone (brustmikrofon) with field telephone equipment. The microphones were primarily used by operators on large telephone exchanges with the großer feldklappenschrank and the 20-line switchboard. But, sometimes the microphones were used by operators on smaller 10-line switchboards. Occasionally, the microphones were used by commanders of artillery battalions.