Basically, it was a hand-held that, when the actor pressed a button, illuminated the clear plastic head. The style of the prop microphone was very close to a real microphone that had been used by amateur radio operators for years, and manufactured by Astatic.
The D-104 had a venerable history and was one of the most often seen microphones for two-way radio over the years. This is probably why the 1956 prop guys designed the "futuristic" version for spaceship C57D's intercom and radio systems to look like a D-104. At least, that's what I've always speculated...If you've got any sort of interest in sound engineering, by the way, Bob Crowley's Microphonium blog needs to be added into your online "favorites" list. Bob is an absolutely brilliant inventor, and in collaboration with Hugh Tripp, has built up a line of top performing microphones using cutting edge technology.
Based in Ashland, MA, Crowley & Tripp may not be strictly on-topic for the Wormtown Taxi blog, but that's right in my back yard as far as operating amateur radio is concerned.

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