3M Peltor Boom Microphone and Down Lead, MSA PTT

Earshot communications and a few other places sell the boom mic and down lead, they aren't cheap. 

If you search Google the model number on the down lead you should be able to find it.

As for second hand value, I'm not sure, I haven't seen many pop up. Sorry I know that doesn't help a great deal, I'd follow the 60% rule of thumb. 

 
I'm pretty sure they're not cheap, but as the guy above said, 60% rule is the norm.

I am however interested if you were thinking of selling?

 
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