Wow.
That's an Astatic D104-xxx ("xxx" signifying the model number of the base, of which there were a few varieties). Definitely one of the classic transceiver microphones of all time, now sadly discontinued. I still have a handheld version of it (D104-M6B) stored somewhere. It's a transistor powered mic (built in amp, 2N2712s I think), runs off a 9V battery, should be a volume control somewhere. Early versions used a Hi-Z crystal element, changing to ceramic later in production. The connector and pinout will be dependent on what model radio the mic was last used with, but essentially there will be a ground line, a PTT (push-to-talk) line and an audio line that you can adapt to your application, just cut the old connector off and rewire.
Sometimes, the schematic was glued inside the bottom cover of the base...remove the bottom and hopefully you'll get lucky. No doubt you'll have to change the battery anyway.
Keep in mind, the D104 crystal elements were sensitive to shock and heat, so it may be hit or miss. Let me know if you end up giving up on it, but I do hope you can get it working. Ballsy output, will certainly command attention as a talkback.
Better yet, buy a 2/10/11 meter radio and strap that thing on the front end. "Goooood morning Vietnaaaam...!"
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I have a microphone identical to this picture.
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Got a pic of the "real" one?
-- Robbie