Tim, could you post a picture of the adjusting switch ? As far as I know, W140 was the first to introduce that feature. Haven't spotted the switch you are referring to on my 420SEL - 1989. Regards Styria
Like most Mercedes options back then you could probably buy another car for the cost. Example Becker Mexico CD player for W126 cost about the price of a Toyota corolla . When new.
Hi Tim Looks like a Motorola They and Nokia used to own the phone market . It looks the same to Motorola that was fitted to Taxi I used to drive in late 80's even yuppies were shocked when they saw car had mobile phone.