Standard CMP879DA DTMF MIC Pinnout

Our amateur radio club was given a bunch of 2-way radio equipment. In the gift pile I found a Standard CMP879DA DTMF MIC. I’ve looked all over the place to find a wiring diagram for this MIC.

I’m hoping to use it on my YASEU FT857D. Any info would be helpful (even what radio that mic went to)

Thanks in advance.