Need help to identify an miniature microphone (Nagra)

Could someone tell me something more about this particular miniature
microphone. I got it from a friend who told me that is was some special
microphone for Nagra SNST-R tape recorder (as he was told when he
got it from his friend). It used to have a square metal screw-in three
pole
connector on the other end - but friend of mine cut it and tried to
solder
it to a standard microphone jack to fit his Sony pocket voice recorder.
However, he wasn't satisfied with the sensitivity of this external mic
so,
continued using built-in and gave this one to me.

As you can see from photos it is quite small, covered with ugly looking
black rubber (just to protect it?)
Microphone capsule under this rubber coating appears to be 3D rectangle
shaped with two narrow cut-outs on the front side.

Can someone tell me something more about this microphone: what kind
of type is, sensitivity, how it can be connected to a non-Nagra
equipment
(my guess it that some power to it has to be supplied?).

Any further info is more than appreciated!

Photos of the microphone could be found at:

http://f2.pg.briefcase.yahoo.com/bc/zorpetus/vwp2?.tok=bcSugPVBmXfF7VLb&.dir=/microphone&.dnm=mic1.jpg&.src=bc

http://f2.pg.briefcase.yahoo.com/bc/zorpetus/vwp2?.tok=bcSugPVBuFnC_5bL&.dir=/microphone&.dnm=mic2.jpg&.src=bc

.

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