Snappy,
Killer guitar! Try looking in the control cavity. As there is probably Gold paint in the pick up cavities, so the control cavity is probably your best bet.
What a rig! Thanks for posting that pic.
....... The amp is an unmolested 1969 Super Bass 100 w. correct cab. and orig. greenbacks inside.
Wilko - Jeff Carlisi of .38 Special has a 1968 Goldtop that he claims came with factory original humbuckers. What are the odds, or is this just an early conversion and a story he was told?
Behind Johnny A in this pic: