[Motorola] Base Station MIC HMN 1027A

[Norman Alexander]

This "vintage" base station microphone (model 1027A) has a unique screw on 6 pin connector and interfaced with an old MAXAR-50.  I have not been able to find any reference to this model.  I need a circuit diagram to do some analysis as what I would normally expect to be the PTT lines, show NC, and upon activating the paddle it goes open, and I can not find a pair that closes.    I think this is a Motorola product originally designed in Germany, and therefore might have a transistor PTT, as the Euro market required some additional signalling.   

Can anyone shed some light on this?

 Regards,

Norm W4QN   (old portable guy)