This set,
the "A" version, has the serial number 6800 and must
date from some time after 1942 when the seroes was introduced
into service. It uses 8 battery-type octal valves.
There were various versions of this receiver and covering different wavelengths and carrying different controls and features.
The A model covers 2 to 12 MHz, and like the others, is designed to work from 6 volts.