Ok - In my shopping around Ebay for the Primo/Nak clone JVC M-510 - I started to notice this JVC mic.
I thought they were unusual for a Japanese mic...
The screw on connector and the capsule - look suspiciously German/Euro to me...
I've come to find this is a measurement mic that was an accessory for one of JVC equalizers.
It runs on a single AA battery.
I've fired it up - and it seems to sound quite nice...havent used it live yet.
This mic is much smaller than I expected.
Satisfied with this one - I scooped another one that had been one ebay for awhile - So now I have a pair.
Im wondering if I might be able to run this on a 9V battery and get a little more SPL handling out of it.