I had a phone in 1978. It was really a fancy Motorola two way radio that connected somehow to the phone system. The phone itslef looked just like a regular slim-line rotary dial phone, and yes, it had a rotary dial. It was not duplex, meaning, only one person could talk and the other had to listen. There was no butting in.

I had it in my all black 76 Mark IV. I was pimpin.....

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport