I found a total of two images for the KMC-2A online. The thumbnail on the right is the large size of that image. The picture above is from eBay, and while it probably is a KMC-2A, everything else seems to indicate it should look more like the one shown behind the radio shown on the TK-931HD page.
While I have no data for this microphone (yet!), I would surmise that it's probably very similar internally to the KMC-27A microphone.
Documents, Schematics, etc
- (Nothing yet)