Helping clean out and catalog the shack of a SK. His XYL showed me a microphone she found. It's one of these jobbies, the retro RCA 44 look. Has a square push bottom on the back, slide switch on the bottom and a toggle switch on the back (Wide/Narrow) Small round sticker on the bottom proclaims HC 5. Removing the sole screw holding it together (one got away at some point.) reveals an HC 5 element dangling from the decomposing remains of a rubber support (I have some MIL SPEC stuff I can re-rig that with, no problem there. Below it is a Heil Pro element. About an hour's research yielded results of some people love them and some hate them, but rebuild/replace the elements to their heart's content, because nothing says HAM RADIO like a big ol' shiny mike which weighs a few pounds sitting on a desk. Looked at Heil support for a brochure, instructions, schematic, anything yields zilch nada. If anyone can please direct me to some operational guide I would appreciate greatly.