This Blaupunkt Boston SQM 23 from 1985 was an option (M688) for the Porsche 911 and the Porsche 944. The Boston SQM 23 is a stereo LW/MW/FM radio cassette player with (3x) 6 preferred keys and automatic transmitter finder which was also used in BMW, Audi, Mercedes, etc. In the mid 80s besides in the Porsches. Tested: powerful sound, good tone and balance control, nice (illuminated) display. The cassette player works perfectly thus nostalgic cassettes can be played and listened to. - type: Blaupunkt Boston SQM 23 - FM, long wave and mid wave (AM). - Year built 1985 - Stereo - 2 x 10 watt output power - 4 speaker connections. - Tone control and balance control In short, a nice looking exclusive Blaupunkt stereo radio/cassette with good operation. Blaupunkt Boston SQM 23 is well packaged, insured and sent by registered mail.