Inspected Goliath today. I can confirm the serial number (stamped on the 8-string headstock) is 78 1000.
The batteries are in the control cavity. The inlay artist stamped his name in the control cavity under the batteries. Between the necks, the back knob is Master Volume. The middle knob is neck selector and the forward knob is a mystery…..ir has 6 positions and seems to affect the Q settings. ? ! It’s directionally noisy. The Mains are in a 1920’s house. The owner adjusted the noise canceller pots a bit but it made little difference. Since he never had a 5-pin….today he saw the neck LED’s for the first time in 7 years! It was a Wonderful afternoon discussing Goliath’s history!