Front view showing
mechanical selectors which control four tuned stages
From the pencilled markings
the transmitter might have been in the hands of a radio ham
This type of transmitter
was used on the 2 metre amateur band in the days when nearly
all VHF transmissions were crystal controlled.
One chose either a 6MHz
or 8MHz crystal which when multiplied developed a stable transmission
between 144 and 146MHz.
The rear view shows the
input circuit to the power amplifier valve, an 832 double tetrode
which could generate around 10 watts of power.