No MPX decoder onboard. For stereo, you have to use the 335 external MPX decoder (or a similar non-Scott unit) for stereo. Unusually, for the era when this was made, it has no support for simulcast AM-FM stereo. This model was discontinued in 1960, and the FM MPX standard wasn't decided until April 1961.
Very unusually, the 320 (and it's earlier predecessor, the 300) used conventional slide rule dials right in the middle of the era when Scott was using their classic round dial tuner design. The AM-FM 330/333 series (with twin round dials) ran from 1955-1965, while the 300/320 series ran from 1957-1960. The 310 series switched from slide rule dials to round dials in 1957, following the 1955 introduction of the 311 and the 330.
