Grundig Signal 500E Transistor radio 

Grundig Signal 500E Black plastic case with 6 pushbuttons, slider volume control and side mounted tuning knob.Long/Medium/Shortwave/VHF.Powered by 9 volt Battery (PP9) or 115/220v mains supply. I purchased this set in 1974 and it is still in regular use (I have circuit diagram and original receipt) made in Portugal

The original cost of the set was 29.95 and the PP9 battery 0.28