This rare unit is a Ray Jefferson CB-711 Saturn 23 channel marine CB radio. Built for use on boats and ships, it includes receive capability for VHF weather channels. At the time this radio was produced, there were only 2 NOAA weather frequencies: 162.400Mhz and 162.550Mhz. I’m guessing this is what the 2 position switch on the front of the radio is used for. You don’t see many of these around anymore.