If the handset was for use with the tannoy type speaker system, why would you need a headset? The speaker was loud enough to be heard if the situation warrants it's use. Perhaps the remote plug for the handset is to allow a little separation from the speaker to the microphone to prevent feedback?
Do all 4 tanks communicate fire orders, or was it primarily the troop comander? From my limited time supporting the artillery, tannoy communications was pretty much a one way affair from the battery CP to the guns.
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